Astronomy Picture of the Day [1]Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2019 December 21 [2]See Explanation. Clicking on the picture will download the highest resolution version available. Solstice to Solstice Solargraph Timelapse Image Credit & [3]Copyright: [4]Sam Cornwell Explanation: [5]The 2019 December Solstice, on the first day of winter in planet Earth's northern hemisphere and summer in the south, is at 4:19 Universal Time December 22. That's December 21 for North America, though. [6]Celebrate with a timelapse animation of the Sun's seasonal progression through the sky. It was made [7]with solargraph images from an ingenious array of 27 pinhole cameras. The first frame from the [8]Solarcan camera matrix was recorded near December 21, 2018. The last frame in the series finished near June 21, 2019, the northern summer solstice. All 27 camera exposures were started at the same time, with a camera covered and removed from the array once a week. Viewed consecutively the pinhole camera pictures accumulate the traces of the Sun's daily path from winter (bottom) to summer (top) solstice. Traces of the Sun's path are reflected by the foreground Williestruther Loch, in the Scottish Borders. Just select the image or follow this link to [9]play the entire 27 frame (gif) timelapse. Tomorrow's picture: a year of sky __________________________________________________________________ [10]< | [11]Archive | [12]Submissions | [13]Index | [14]Search | [15]Calendar | [16]RSS | [17]Education | [18]About APOD | [19]Discuss | [20]> __________________________________________________________________ Authors & editors: [21]Robert Nemiroff ([22]MTU) & [23]Jerry Bonnell ([24]UMCP) NASA Official: Phillip Newman [25]Specific rights apply. [26]NASA Web Privacy Policy and Important Notices A service of: [27]ASD at [28]NASA / [29]GSFC & [30]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://apod.nasa.gov/apod/image/1912/solarcanMatrixSolstice.gif 3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 4. https://twitter.com/Samcornwell 5. https://earthsky.org/astronomy-essentials/everything-you-need-to-know-december-solstice 6. https://visibleearth.nasa.gov/images/52248/seeing-equinoxes-and-solstices-from-space 7. https://apod.nasa.gov/apod/ap190627.html 8. https://petapixel.com/2019/07/17/this-is-the-worlds-first-solargraphy-timelapse/ 9. https://apod.nasa.gov/apod/image/1912/solarcanMatrixSolstice.gif 10. https://apod.nasa.gov/apod/ap191220.html 11. https://apod.nasa.gov/apod/archivepix.html 12. https://apod.nasa.gov/apod/lib/apsubmit2015.html 13. https://apod.nasa.gov/apod/lib/aptree.html 14. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 15. https://apod.nasa.gov/apod/calendar/allyears.html 16. https://apod.nasa.gov/apod.rss 17. https://apod.nasa.gov/apod/lib/edlinks.html 18. https://apod.nasa.gov/apod/lib/about_apod.html 19. http://asterisk.apod.com/discuss_apod.php?date=191221 20. https://apod.nasa.gov/apod/ap191222.html 21. http://www.phy.mtu.edu/faculty/Nemiroff.html 22. http://www.phy.mtu.edu/ 23. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 24. http://www.astro.umd.edu/ 25. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 26. https://www.nasa.gov/about/highlights/HP_Privacy.html 27. https://astrophysics.gsfc.nasa.gov/ 28. https://www.nasa.gov/ 29. https://www.nasa.gov/centers/goddard/ 30. http://www.mtu.edu/