The sky on
your birthday.
“Naked-eye Comet ZTF” is copyrighted by Organización Salmantina de la Astronáutica y el Espacio. NASA has permission to show it and we don't, so it isn't on this card.
See it on NASA's siteComet C/2022 E3 (ZTF) is now visible to the naked eye from dark sky locations. This image, taken near Salamanca, Spain, shows its green coma, a short dust tail, and a long ion tail. The comet, a visitor from the distant Oort Cloud, rounded the Sun on January 12.
The Sun on 21 January 2023
NASA SDO took this picture on 21 January 2023, the day itself, not a release date.
We cannot put this date's photograph on paper at poster size. We can print the nearest public archive plate to your date instead.
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Released on your day
Space pictures released on your month and day in other years, or a few days either side. Each one is sharp enough to print as a poster.
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The Sun on your day The Sun on 21 January 2023 See it as a poster -
The Earth on your day The Earth on 21 January 2023 · Sahara, Algeria See it as a poster -
Released on 21 January 2016 Hubble Unveils a Tapestry of Dazzling Diamond-Like Stars See it as a poster -
Released on 21 January 2016 Dazzling diamonds of Trumpler 14 See it as a poster -
Released on 21 January 2004 Empty Nest See it as a poster -
Released on 21 January 2025 The city lights of Lima, Peru See it as a poster -
Released on 21 January 2025 The city lights of Buenos Aires, Argentina See it as a poster
In tropical astrology, 21 JAN 2023 falls under Aquarius (♒). The sign's window runs from 01-20 through 02-18. Aquarius is home to the Helix Nebula, the closest planetary nebula to Earth. The Sun was crossing this region of the sky on 21 JAN 2023.
Questions about January 21, 2023
What space photo was released on January 21, 2023?
NASA's Astronomy Picture of the Day for January 21, 2023 was "Naked-eye Comet ZTF". It's a photographer's copyrighted image, so we link to it on NASA's site and show the Sun or the Earth that day instead.
What was the Moon's phase on January 21, 2023?
A new moon, about 0% lit.
What day of the week was January 21, 2023?
January 21, 2023 was a Saturday, day 21 of the 365 days in 2023.
What did the Sun and the Earth look like on January 21, 2023?
NASA's Solar Dynamics Observatory photographed the Sun that day, and NASA's Terra satellite photographed the whole Earth. Both are on this page, next to the card.
Is it free?
Yes. Seeing, sharing and downloading the card is free, and there's no account to make.