https://astrorav.com/2025/10/31/abraham-the-astronomer-part-2/https://astrorav.com/wp-content/uploads/2025/10/null-2.pngnullhttps://astrorav.com/wp-content/uploads/2025/10/null-1.pngnullhttps://astrorav.com/wp-content/uploads/2025/10/null.pngnullAbraham looks at the Stars2025-11-02T21:01:03+00:00monthlyhttps://astrorav.com/2024/11/11/abraham-the-astronomer/https://astrorav.com/wp-content/uploads/2024/11/avraham-1686079649-e1731336315536.pngAbraham topFresco depicting Abraham Sun(?), Moon and stars (possibly turning his back on them) From the (excavated) Dura Europos synagogue c. 3rd cen. CE. (Although other interpretations think it depicts Moses.)https://astrorav.com/wp-content/uploads/2024/11/null-7.pngnullhttps://astrorav.com/wp-content/uploads/2024/11/null-6.pngnullhttps://astrorav.com/wp-content/uploads/2024/11/null-5.pngnullhttps://astrorav.com/wp-content/uploads/2024/11/null-4.pngnullhttps://astrorav.com/wp-content/uploads/2024/11/null-3.pngnullhttps://astrorav.com/wp-content/uploads/2024/11/null-2.pngnullhttps://astrorav.com/wp-content/uploads/2024/11/null.pngAbraham and heavenly bodies, frescoFresco depicting Abraham Sun(?), Moon and stars (possibly turning his back on them) From the (excavated) Dura Europos synagogue c. 3rd cen. CE. (Although other interpretations think it depicts Moses.)2024-11-11T15:16:35+00:00monthlyhttps://astrorav.com/2015/12/07/the-first-light/https://astrorav.com/wp-content/uploads/2015/12/big-bang-gsfc-arrow_jpg.jpgbig bang gsfc Arrow_JPGhttps://astrorav.com/wp-content/uploads/2015/12/big-bang-cone-pic.jpgbig bang cone pichttps://astrorav.com/wp-content/uploads/2015/12/cmb-uniformity.pngCMB uniformityhttps://astrorav.com/wp-content/uploads/2015/12/penzias-wilson.jpgPenzias & Wilsonhttps://astrorav.com/wp-content/uploads/2015/12/hubble.jpgHubblehttps://astrorav.com/wp-content/uploads/2015/12/end-of-opacity.jpgEnd of opacityTransition from era of opacity to light traveling freelyhttps://astrorav.com/wp-content/uploads/2015/12/em-spectrum2.jpgEM spectrum2The Eletromagnetic Spectrumhttps://astrorav.com/wp-content/uploads/2015/12/hubbles-law-plot.jpgHubbles law plothttps://astrorav.com/wp-content/uploads/2015/12/particle-annihilation.jpgparticle annihilationParticle pair creation & annihilationhttps://astrorav.com/wp-content/uploads/2015/12/big-bang-hot-plot.jpgBig bang Hot plotGraph of universe's temperature over time2024-11-11T15:13:46+00:00monthlyhttps://astrorav.com/2021/12/13/origins-of-rainwater-in-taanit/https://astrorav.com/wp-content/uploads/2021/12/null-4.pngnullhttps://astrorav.com/wp-content/uploads/2021/12/null-3.pngnullhttps://astrorav.com/wp-content/uploads/2021/12/null-2.pngnullhttps://astrorav.com/wp-content/uploads/2021/12/null-1.pngnullhttps://astrorav.com/wp-content/uploads/2021/12/null.pngnull2024-11-11T15:11:44+00:00monthlyhttps://astrorav.com/2024/10/01/rosh-hashanah-vs-the-sun-blessing/https://astrorav.com/wp-content/uploads/2024/09/image-3.pngimagehttps://astrorav.com/wp-content/uploads/2024/09/talit4.jpgTalit4https://astrorav.com/wp-content/uploads/2023/09/null-2.pngnullhttps://astrorav.com/wp-content/uploads/2023/09/null-1.pngnullhttps://astrorav.com/wp-content/uploads/2023/09/null.pngnull2024-10-01T03:26:34+00:00monthlyhttps://astrorav.com/2021/10/01/ramban-and-the-early-atmosphere/https://astrorav.com/wp-content/uploads/2021/10/null-3.pngnullhttps://astrorav.com/wp-content/uploads/2021/10/null-2.pngnullhttps://astrorav.com/wp-content/uploads/2021/10/null-1.pngnullhttps://astrorav.com/wp-content/uploads/2021/10/null.pngnull2021-12-13T02:25:51+00:00monthlyhttps://astrorav.com/2017/12/05/will-the-real-equinox60-please-stand-up/https://astrorav.com/wp-content/uploads/2017/12/220px-gregorianscher_kalender_petersdom.jpg220px-Gregorianscher_Kalender_PetersdomDetail Pope Gregory's tomb by Camillo Rusconi (c. 1723); Antonio Lilio is genuflecting before the pope, presenting his printed calendar.https://astrorav.com/wp-content/uploads/2017/12/inter-grav-gregorian-procl.jpgInter-grav Gregorian ProclPapal edict, Inter Gravissimas, establishing the Gregorian Calendar, 1582https://astrorav.com/wp-content/uploads/2017/12/250px-d7a6d799d795d79f_d7a8d791d799_d799d795d7a1d7a3_d7a7d790d7a8d795.jpg250px-ציון_רבי_יוסף_קארוGrave of R. Yosef Karo, a.k.a. The Beit Yosef, author of the Shulchan Aruch (in Tzefat, Israel)https://astrorav.com/wp-content/uploads/2017/12/equinoxessolsticesdiagram.jpgEquinoxesSolsticesDiagramDiagram of the Earth's axial tilt with respect to the Sun on the Equinoxes and Solstices. Not to scale. (Thompson Higher Education, 2007)https://astrorav.com/wp-content/uploads/2017/12/julian-calendar1.jpgJulian-CalendarAn ancient carving recording the Julian Calendarhttps://astrorav.com/wp-content/uploads/2017/12/machazit-hashekel-on-tal-umatttar-date.jpgMachazit Hashekel on tal umatttar datehttps://astrorav.com/wp-content/uploads/2017/12/beityosef-on-tal-umattar-date.jpgBeitYosef on Tal Umattar date2021-12-05T03:21:14+00:00monthlyhttps://astrorav.com/2021/11/14/lunar-observations-in-rosh-hashanah/https://astrorav.com/wp-content/uploads/2021/11/02_21_figure-anno.jpeg02_21_Figure-Annohttps://astrorav.com/wp-content/uploads/2021/11/02_24_figure-anno.jpeg02_24_Figure-Annohttps://astrorav.com/wp-content/uploads/2021/11/null-1.pngnullhttps://astrorav.com/wp-content/uploads/2021/11/null.pngnullhttps://astrorav.com/wp-content/uploads/2021/11/unnamed-file.png.pnghttps://astrorav.com/wp-content/uploads/2021/11/http3a2f2fwhenisthenewmoon.com2fwp-content2fuploads2f20152f092fyom-teruah-moon-2015.jpg.jpeghttpwhenisthenewmoon.comwp-contentuploads201509YOm-Teruah-Moon-2015.jpg2021-11-14T17:01:02+00:00monthlyhttps://astrorav.com/2020/11/30/black-holes-in-pesachim/https://astrorav.com/wp-content/uploads/2020/11/null-5.pngnullhttps://astrorav.com/wp-content/uploads/2020/11/null-4.pngnullhttps://astrorav.com/wp-content/uploads/2020/11/null-3.pngnullhttps://astrorav.com/wp-content/uploads/2020/11/null-2.pngnullhttps://astrorav.com/wp-content/uploads/2020/11/null-1.pngnullhttps://astrorav.com/wp-content/uploads/2020/11/null.pngA Neutron Star in X-ray wavelengthsA Neutron Star at the center of a supernova remnant, observed by the Chandra X-ray Observatory, in false color corresponding to X-ray wavelength bands. The supernova was observed by Chinese astronomers in 386 CE.2021-10-01T16:28:56+00:00monthlyhttps://astrorav.com/2020/05/28/shavuot-philo-astronomy-and-pythagoreans/https://astrorav.com/wp-content/uploads/2020/05/18947_6_en_2_fig14_html.gif18947_6_en_2_fig14_htmlhttps://astrorav.com/wp-content/uploads/2020/05/null-2.jpegnullhttps://astrorav.com/wp-content/uploads/2020/05/null-1.jpegnullhttps://astrorav.com/wp-content/uploads/2020/05/null.jpegnullhttps://astrorav.com/wp-content/uploads/2020/05/null.pngnull2020-11-30T03:37:28+00:00monthlyhttps://astrorav.com/2019/10/25/bereishit-and-the-nobel-prize/https://astrorav.com/wp-content/uploads/2019/10/nobel_prize.gifnobel_prizehttps://astrorav.com/wp-content/uploads/2019/10/null-4.pngnullhttps://astrorav.com/wp-content/uploads/2019/10/null-3.pngnullhttps://astrorav.com/wp-content/uploads/2019/10/null-2.pngnullhttps://astrorav.com/wp-content/uploads/2019/10/null-1.pngnullhttps://astrorav.com/wp-content/uploads/2019/10/null.pngnull2020-05-28T15:11:49+00:00monthlyhttps://astrorav.com/2020/04/01/yotzer-or-the-astronomers-blessing-2/https://astrorav.com/wp-content/uploads/2020/03/planetas-en-inglc3a9s.jpgplanetas-en-inglc3a9shttps://astrorav.com/wp-content/uploads/2020/03/null-1.jpegnullhttps://astrorav.com/wp-content/uploads/2020/03/null.jpegnull2020-04-01T00:51:26+00:00monthlyhttps://astrorav.com/2019/12/30/the-menorah-and-planets/https://astrorav.com/wp-content/uploads/2019/12/menorah-5-tall-covered-in-gold-leaf.jpegMenorah, 5' Tall, Covered in Gold Leaf2020-04-01T00:48:47+00:00monthlyhttps://astrorav.com/2019/07/19/haadam-al-hayareach-man-on-the-moon-part-4/https://astrorav.com/wp-content/uploads/2019/07/596px-apollo_11_lunar_lander_-_5927_nasa.jpg596px-Apollo_11_Lunar_Lander_-_5927_NASAhttps://astrorav.com/wp-content/uploads/2019/07/null-13.pngnullhttps://astrorav.com/wp-content/uploads/2019/07/null-12.pngnullhttps://astrorav.com/wp-content/uploads/2019/07/null-11.pngnullhttps://astrorav.com/wp-content/uploads/2019/07/null-10.pngnull2019-10-25T07:28:48+00:00monthlyhttps://astrorav.com/2016/10/02/creating-the-world-again/https://astrorav.com/wp-content/uploads/2016/10/heic1501a.jpgheic1501aA Stellar "Nursery"; new stars forming in a molecular cloud of gas and dust (observed By the Hubble Space Telescope)https://astrorav.com/wp-content/uploads/2016/10/sn-1987a.jpgsn-1987aSupernova 1987a; L & R are before & after pictures, note the extremely increased brightnesshttps://astrorav.com/wp-content/uploads/2016/10/multi-shell-burning.jpgmulti-shell-burningDiagram of star with multiple shells in its core with multiple fusion processes occurring in themhttps://astrorav.com/wp-content/uploads/2016/10/heavy-element-fusion.jpgheavy-element-fusionExamples of fusion of heavier elements, which takes place in more massive starshttps://astrorav.com/wp-content/uploads/2016/10/planetary-nebulae.jpgplanetary-nebulaePlanetary Nebulae; L-R Ring Nebula, Eskimo Nebula, Spirograph Nebula and the Hourglass Nebula (all of the observed by the Hubble Space Telescope)https://astrorav.com/wp-content/uploads/2016/10/he-core-wh-shell-burning.jpghe-core-wh-shell-burningDiagram of a star with a Helium core fusing into carbon with a Hydrogen burning shellhttps://astrorav.com/wp-content/uploads/2016/10/cno-cycle.jpgcno-cycleThe CNO Cycle by which hydrogen is fused into helium in stars more massive than the Sun.https://astrorav.com/wp-content/uploads/2016/10/proton-proton-chain.jpgproton-proton-chainThe Proton-Proton Chain by which hydrogen is fused into helium in stars like the Sun.https://astrorav.com/wp-content/uploads/2016/10/periodic-table.jpgperiodic-tableThe Periodic Table of the Elements listing all known elements in order of their atomic number (number of protons in a nucleus)https://astrorav.com/wp-content/uploads/2016/10/crab-nebula.jpgcrab-nebulaThe Crab Nebula. The remains of a star that became a supernova and was observed in 1054 CE (and recorded by Chinese astronomers).2019-10-25T07:28:23+00:00monthlyhttps://astrorav.com/2019/07/17/haadam-al-hayareach-man-on-the-moon-part-2/https://astrorav.com/wp-content/uploads/2019/07/220px-flag_of_the_egyptian_revolution_1952.png220px-Flag_of_the_Egyptian_Revolution_(1952)https://astrorav.com/wp-content/uploads/2019/07/earthrise-12-24-1968-apollo-e1482400729793.jpgearthrise-12-24-1968-Apollo-e1482400729793https://astrorav.com/wp-content/uploads/2019/07/apollo-flag-planting.jpgapollo flag plantinghttps://astrorav.com/wp-content/uploads/2019/07/null-9.pngnullhttps://astrorav.com/wp-content/uploads/2019/07/null-8.pngnullhttps://astrorav.com/wp-content/uploads/2019/07/null-7.pngnullhttps://astrorav.com/wp-content/uploads/2019/07/null-6.pngnullhttps://astrorav.com/wp-content/uploads/2019/07/null-5.pngnullhttps://astrorav.com/wp-content/uploads/2019/07/null-4.pngnullhttps://astrorav.com/wp-content/uploads/2019/07/null-3.pngnull2019-10-25T07:24:31+00:00monthlyhttps://astrorav.com/2019/07/19/haadam-al-hayareach-man-on-the-moon-part-3/https://astrorav.com/wp-content/uploads/2019/07/foot-on-moon.jpgfoot on moonhttps://astrorav.com/wp-content/uploads/2019/07/null-17.pngnullhttps://astrorav.com/wp-content/uploads/2019/07/null-16.pngnullhttps://astrorav.com/wp-content/uploads/2019/07/null-15.pngnullhttps://astrorav.com/wp-content/uploads/2019/07/null-14.pngnull2019-10-25T07:22:51+00:00monthlyhttps://astrorav.com/2016/05/05/machar-chodesh/https://astrorav.com/wp-content/uploads/2016/05/another-crescent-moon.jpganother crescent moonhttps://astrorav.com/wp-content/uploads/2016/05/crescent-moon.jpgcrescent moon2019-07-17T08:18:58+00:00monthlyhttps://astrorav.com/2016/01/18/theres-a-bad-star-on-the-rise/https://astrorav.com/wp-content/uploads/2016/01/aries_20151018_ex_web_new_bsyeom.jpgaries_20151018_ex_web_new_bsyeomThe Constellation Arieshttps://astrorav.com/wp-content/uploads/2016/01/ralbag-mazal-tleh.pngralbag mazal tleh2019-07-17T07:10:17+00:00monthlyhttps://astrorav.com/2019/06/28/blue-skies-blue-dyes/https://astrorav.com/wp-content/uploads/2019/06/blue-sky-and-sea-1.jpgblue sky and seahttps://astrorav.com/wp-content/uploads/2019/06/tekhelet-tzitzit.pngtekhelet tzitzitVarious different ways of winding and knotting tzitzit with tekhelet from https://www.tekhelet.com/https://astrorav.com/wp-content/uploads/2019/06/8136element.bromine3.jpg8136element.bromine3Dying wool in murex trunculus based dye from http://tekhelet.com/pdf/Chem_Eng.htmlhttps://astrorav.com/wp-content/uploads/2019/06/tekheletseashell.jpgtekheletseashellMurex trunculushttps://astrorav.com/wp-content/uploads/2019/06/debromination-e1561708401591.jpgdebrominationMolecular diagrams, from R. C. Hoffman, R. Zilber and R. E. Hoffman, NMR spectroscopic study of the Murex trunculus dyeing process Magnetic Resonance Chemistry 2010, 48, 892–895https://astrorav.com/wp-content/uploads/2019/06/why-sky-blue.jpgwhy sky blueDiagram of preferential scattering of blue vs. red light, at noon and sunsethttps://astrorav.com/wp-content/uploads/2019/06/koren_dha20_2005.jpgKOREN_DHA20_2005Plate 15.5 The three exhaust dyeings from the fermentative dye vat From Koren Z.C. 2005. ‘The First Optimal All-Murex All-Natural Purple Dyeing in the Eastern Mediterranean in a Millennium and a Half ’, Dyes in History and Archaeology 20, p. 1422019-07-17T07:09:22+00:00monthlyhttps://astrorav.com/2018/07/27/zachor-and-shamor-and-the-wave-particle-duality/https://astrorav.com/wp-content/uploads/2018/07/double-slit_experiment_with_electrons.pngDouble-slit_experiment_with_electronshttps://astrorav.com/wp-content/uploads/2018/07/1470939110-feynmansdoub.png1470939110-feynmansdoubhttps://astrorav.com/wp-content/uploads/2018/07/null1.pngnullhttps://astrorav.com/wp-content/uploads/2018/07/null.pngnull2019-07-17T07:07:58+00:00monthlyhttps://astrorav.com/2018/08/10/eclipses/https://astrorav.com/wp-content/uploads/2018/08/null5.pngnullhttps://astrorav.com/wp-content/uploads/2018/08/null4.pngnullhttps://astrorav.com/wp-content/uploads/2018/08/null3.pngnullhttps://astrorav.com/wp-content/uploads/2018/08/null2.pngnullhttps://astrorav.com/wp-content/uploads/2018/08/null1.pngnullhttps://astrorav.com/wp-content/uploads/2018/08/null.pngnull2019-07-17T07:07:13+00:00monthlyhttps://astrorav.com/2019/07/16/haadam-al-hayareach-man-on-the-moon/https://astrorav.com/wp-content/uploads/2019/07/aldrin2.jpgaldrin2https://astrorav.com/wp-content/uploads/2019/07/aldrin-on-moon-e1563255085988.jpgAldrin on moonhttps://astrorav.com/wp-content/uploads/2019/07/wide-aldrin-on-moon.jpgwide aldrin on moonhttps://astrorav.com/wp-content/uploads/2019/07/intro.jpgintrohttps://astrorav.com/wp-content/uploads/2019/07/contents.jpgcontents2019-07-17T07:05:54+00:00monthlyhttps://astrorav.com/2016/11/11/abraham-and-the-first-planetarium/https://astrorav.com/wp-content/uploads/2016/11/old-hayden.pngold-haydenThe Original Hayden Plantarium building, NY, NYhttps://astrorav.com/wp-content/uploads/2016/11/dome-planetarium.jpgdome-planetarium2017-12-05T04:12:53+00:00monthlyhttps://astrorav.com/2017/07/07/bilaams-star-prophecy/https://astrorav.com/wp-content/uploads/2017/07/sun.jpgSunThe Sunhttps://astrorav.com/wp-content/uploads/2017/07/sun-random-walk.jpgsun random walkDiagram of a random walk of a photon from the center to edge of radiation zone (not to scale!) (From Pearson, Cosmic Perspective)https://astrorav.com/wp-content/uploads/2017/07/sun-zones-cutaway.jpgsun zones cutawayCutaway diagram of the Sun showing the core, radiation and convection zones. (from Pearson, Cosmic Perspective)https://astrorav.com/wp-content/uploads/2017/07/darach-kochav-ralbag.jpgdarach kochav - ralbag2017-12-05T04:02:49+00:00monthlyhttps://astrorav.com/2016/04/07/the-first-mitzvah-the-first-month/https://astrorav.com/wp-content/uploads/2016/04/moon-over-egypt-cropped.jpgmoon over egypt croppedhttps://astrorav.com/wp-content/uploads/2016/04/molad-over-jlm.jpgmolad over jlmThe molad - the first visible sliver of the Moon - viewed over Jerusalemhttps://astrorav.com/wp-content/uploads/2016/04/moon-over-egypt.jpgmoon over egypthttps://astrorav.com/wp-content/uploads/2016/04/ralbag-hachodesh.jpgralbag hachodesh2017-07-10T01:25:33+00:00monthlyhttps://astrorav.com/2017/01/01/the-lights-of-kislev/https://astrorav.com/wp-content/uploads/2017/01/arch-of-titus1-1024x683.jpegarch-of-titus1-1024x683The Menorah from the Temple in Jerusalem, depicted on the Arch of Titus in Rome (from http://blogs.yu.edu/news/menorah-myth-busters/)https://astrorav.com/wp-content/uploads/2017/01/rainbow-diagram.gifrainbow-diagramDiagram of Rainbow formation & viewing (from http://www.physicsclassroom.com/class/refrn/Lesson-4/Rainbow-Formation)https://astrorav.com/wp-content/uploads/2017/01/rainbow-spectrum.jpgrainbow-spectrumObservers see different colors from different drops depending on angle (from http://science.howstuffworks.com/nature/climate-weather/storms/rainbow2.htm)https://astrorav.com/wp-content/uploads/2017/01/rainbow-raindrop.jpgrainbow-raindropDiagram of sunlight refractring in a raindrop (from http://science.howstuffworks.com/nature/climate-weather/storms/rainbow2.htm)https://astrorav.com/wp-content/uploads/2017/01/secondaryrainbow.jpgsecondaryrainbowA rainbow, including a secondary rainbowhttps://astrorav.com/wp-content/uploads/2017/01/titusarchmenora.jpgtitusarchmenoraThe Menorah from the Temple in Jerusalem, depicted on the Arch of Titus in Rome (from http://www.biblical-finds.com/oldtestament/menora.html)2017-07-07T16:25:43+00:00monthlyhttps://astrorav.com/2016/04/14/midrash-the-making-of-the-moon/https://astrorav.com/wp-content/uploads/2016/04/full-moon-over-the-sea2.jpgfull-moon-over-the-sea2https://astrorav.com/wp-content/uploads/2016/04/tidal-friction.jpgtidal frictionSchematic diagram of Moon and rotation of tidal bulges on Earth. (from Pearson, Cosmic Perspective)https://astrorav.com/wp-content/uploads/2016/04/tides-phases-diagram.jpgtides & phases diagramDiagram of the Moon's and Sun's gravitational pull on Earth at different times of the (lunar) month. (from Pearson, The Cosmic Perspective)https://astrorav.com/wp-content/uploads/2016/04/tides-diagram.jpgtides diagramDiagram of the Moon's differential gravitational pull on different sides (and center) of Earth. (from Pearson, The Cosmic Perspective)https://astrorav.com/wp-content/uploads/2016/04/moon-forming.pngmoon formingArtist's depiction of the Moon's formation. (from Pearson, The Cosmic Perspective)2016-12-02T15:15:20+00:00monthlyhttps://astrorav.com/2016/10/20/the-astronomers-blessing/https://astrorav.com/wp-content/uploads/2016/10/einstein-young.jpgeinstein-youngAlbert Einsteinhttps://astrorav.com/wp-content/uploads/2016/10/2011-nobel-winners.png2011-nobel-winnersAdam Riess, Saul Perlmutter and Brian Schmidt winners of the 2011 Nobel Prize in physicshttps://astrorav.com/wp-content/uploads/2016/10/halo-diagram.jpghalo-diagramDiagram of spiral galaxy showing luminous matter surrounded by much larger halo of dark matter. (from Pearson, Cosmic Perspective.)https://astrorav.com/wp-content/uploads/2016/10/grav-lensing-diagram.jpggrav-lensing-diagramDiagram of gravitational lensing showing how light is bent around massive galaxy cluster, causing multiple images of the background galaxy. (from Pearson, Cosmic Perspective.)https://astrorav.com/wp-content/uploads/2016/10/xray-bullet-cluster-collis-2.jpgxray-bullet-cluster-collis-2Another observation of galaxy clusters indicating dark matter. (False color) X-ray observations show where the hot gas is, and blue (also false color) show where calculations indicate mass is located. (from Cosmic Perspective, Pearson)https://astrorav.com/wp-content/uploads/2016/10/rotation-curve-doppler.jpgrotation-curve-dopplerDiagram of observations of galactic rotation speeds using doppler shift of opposite sides of a galaxy.https://astrorav.com/wp-content/uploads/2016/10/rot-curves-plotted.jpgrot-curves-plottedRotation curves of several galaxies, with orbital velocity plotted vs. distance from center of galaxies. https://astrorav.com/wp-content/uploads/2016/10/cluster-lensing.jpgcluster-lensingGravitational lensing of distant galaxies by a closer galactic cluster. Observed by Hubble Space Telescope.2016-10-20T05:07:14+00:00monthlyhttps://astrorav.com/2015/12/14/zot-chanukah-incandescence/https://astrorav.com/wp-content/uploads/2015/12/278233801_1280.jpg278233801_1280“What is a Flame?” by Ben Ames, on Vimeo2016-10-06T01:56:34+00:00monthlyhttps://astrorav.com/2015/12/11/the-first-festival-of-light/https://astrorav.com/wp-content/uploads/2015/12/sun-path-in-hemisphere.jpgsun path in hemisphereSun's daily path through sky in the Northern Hemisphere, illustrated on solstices and equinoxeshttps://astrorav.com/wp-content/uploads/2015/12/axial-tilt-illumination.jpgaxial tilt illuminationEarth's illumination from the Sun showing axial tilt in Northern Hemisphere summer https://astrorav.com/wp-content/uploads/2015/12/orbit-with-equinoxes-solstices.jpgorbit with equinoxes & solsticesEarth's orbit around the Sun showing axial tilt and illumination on solstices and equinoxes.https://astrorav.com/wp-content/uploads/2015/12/orbit-closest-farthest.jpgorbit closest-farthestEarth's orbit around the Sun showing equinoxes, solstices and closest and farthest orbital distancehttps://astrorav.com/wp-content/uploads/2015/12/solstice-at-pole.jpgsolstice at polePath of the Sun on the summer solstice at the Arctic Circle2016-10-06T01:48:42+00:00monthlyhttps://astrorav.com/2015/12/14/dreidel-earth/https://astrorav.com/wp-content/uploads/2015/12/dreidel_0.jpgdreidel_0https://astrorav.com/wp-content/uploads/2015/12/dreidel-spinning.jpgdreidel spinninghttps://astrorav.com/wp-content/uploads/2015/12/celestial-sphere-constellation.jpgcelestial sphere constellationCelestial Sphere model of sky, showing constellations and Celestial Poleshttps://astrorav.com/wp-content/uploads/2015/12/celestial-sphere.jpgcelestial sphereCelestial Poles, Celestial Equator and the Ecliptichttps://astrorav.com/wp-content/uploads/2015/12/precession.jpgprecessionEarth's precession is like a spinning top2016-10-06T01:37:29+00:00monthlyhttps://astrorav.com/2015/12/20/the-torah-awakens/https://astrorav.com/wp-content/uploads/2015/12/jedi-party-meditation.jpgjedi party meditationThe author leads Younglings in meditating on the Forcehttps://astrorav.com/wp-content/uploads/2015/12/haninhanukkah.jpghaninhanukkahhttps://astrorav.com/wp-content/uploads/2015/12/the_torah_awakens.jpgThe_Torah_Awakens2016-10-06T01:35:40+00:00monthlyhttps://astrorav.com/2015/12/22/asara-btevet-the-babylonian-empire-strikes-back-the-torah-awakens/https://astrorav.com/wp-content/uploads/2015/12/at-at-jlm.jpgat-at jlmhttps://astrorav.com/wp-content/uploads/2015/12/at-at-jlm.pngat-at jlm2016-10-06T01:33:13+00:00monthlyhttps://astrorav.com/2015/12/28/blessings-on-comets/https://astrorav.com/wp-content/uploads/2015/12/roboao.jpgroboaoPalomar 1.5 Meter telescopehttps://astrorav.com/wp-content/uploads/2015/12/2-1meter.jpg2-1Meter2.1 meter telescope at Kitt Peak Observatoryhttps://astrorav.com/wp-content/uploads/2015/12/perseid_bright_8-12-2012_stefano_de_rosa_italy.jpegPerseid_bright_8-12-2012_Stefano_De_Rosa_ItalyA bright Perseid meteor photographed by astrophotographer Stefano De Rosahttps://astrorav.com/wp-content/uploads/2015/12/catalina-richard-tyson.jpgcatalina-richard-tysonComet Catalina photo by Richard Tyson from space.com2016-10-06T01:31:40+00:00monthlyhttps://astrorav.com/2016/02/11/the-thirteenth-month-and-the-constellation-ophiuchus/https://astrorav.com/wp-content/uploads/2016/02/ophiuchus_map02.jpgOphiuchus_Map02https://astrorav.com/wp-content/uploads/2016/02/250px-ophiuchus_iau-svg.png250px-Ophiuchus_IAU.svgThe Constellation Ophiuchushttps://astrorav.com/wp-content/uploads/2016/02/sidney_hall_-_uranias_mirror_-_taurus_poniatowski_serpentarius_scutum_sobiesky_and_serpens.jpgSidney_Hall_-_Urania's_Mirror_-_Taurus_Poniatowski,_Serpentarius,_Scutum_Sobiesky,_and_SerpensOphiuchus holding the serpent, Serpens, as depicted in Urania's Mirror, a set of constellation cards published in London c. 1825. https://astrorav.com/wp-content/uploads/2016/02/220px-azophi_ophiuchus.jpg220px-Azophi_OphiuchusOphiuchus in a manuscript copy of Azophi's Uranometry, 18th-century copy of a manuscript prepared for Ulugh Beg in 1417.https://astrorav.com/wp-content/uploads/2016/02/zodiac.jpgzodiacDiagram of Constellations of the Zodiac and apparent relative position of the Sun and Earth throughout the year.2016-10-06T01:30:30+00:00monthlyhttps://astrorav.com/2016/03/04/the-shining-faces-of-moshe-the-moon/https://astrorav.com/wp-content/uploads/2016/03/mmon-wearthshine-skinner.jpgMmon wEarthshine skinnerMoon showing Earthshine from http://science.nasa.gov/media/medialibrary/2005/10/03/04oct_leonardo_resources/skinner.jpghttps://astrorav.com/wp-content/uploads/2016/03/dsc_3900m_filtered-300x244.jpgDSC_3900m_filtered-300x244This view of the thin, Earthlit crescent Moon was captured by Gary Seronik while visiting Costa Rica from http://www.skynews.ca/earthshine-delight/https://astrorav.com/wp-content/uploads/2016/03/earth-light-spectrum-moon-earthshine.jpgearth-light-spectrum-moon-earthshineBy observing earthshine astronomers can study the properties of light reflected from Earth as if it were an exoplanet and search for signs of life. Credit: ESO/L. Calçada - See more at: http://www.space.com/14712-earthshine-moon-light-alien-life.htmlhttps://astrorav.com/wp-content/uploads/2016/03/moon-earthshine-abhijit-juvekar-12-1-2013.jpgmoon-earthshine-Abhijit-Juvekar-12-1-2013The Moon showing Earthshine from http://en.es-static.us/upl/2013/12/moon-earthshine-Abhijit-Juvekar-12-1-2013.jpghttps://astrorav.com/wp-content/uploads/2016/03/whatisearthshine.jpgwhatisearthshineDiagram of sunlight reflecting off of Earth and the Moon to create Earthshine from http://catholicscienceteacher6.blogspot.com/2013_12_01_archive.htmlhttps://astrorav.com/wp-content/uploads/2016/03/moon_phase_diagram_for_simple_english_wikipedia.gifMoon_Phase_Diagram_for_Simple_English_WikipediaPhases of the Moon from https://upload.wikimedia.org/wikipedia/commons/6/6a/Moon_Phase_Diagram_for_Simple_English_Wikipedia.GIFhttps://astrorav.com/wp-content/uploads/2016/03/last_quarter_moon_diagram_1.jpgLast_quarter_moon_diagram_1The view from space of the moon, Earth and sun as seen from above (not to scale.) Sunlight illuminates the left half of the moon from our perspective. Our observer (in red) stands on the sunrise line separating day and night on our planet. Illustration: Bob King from http://astrobob.areavoices.com/2009/03/18/moonshine-sunshine-treeshine/2016-10-06T01:25:04+00:00monthlyhttps://astrorav.com/about/https://astrorav.com/wp-content/uploads/2015/11/lspn_comet_halley1.jpglspn_comet_halley1Comet Halleyhttps://astrorav.com/wp-content/uploads/2015/11/dsc1477.jpgDr. GerschI defended my dissertation and all I got was this jesrsey...2015-12-06T05:16:21+00:00weekly0.6https://astrorav.comdaily1.02025-11-02T21:01:03+00:00