The sky on
your birthday.
“Rainbow Airglow over the Azores” is copyrighted by Miguel Claro (TWAN); Rollover Annotation: Judy Schmidt. NASA has permission to show it and we don't, so it isn't on this card.
See it on NASA's siteThe sky over the Azores glows like a repeating rainbow due to airglow. Airglow happens all the time, but it's usually faint. A disturbance, like an approaching storm, can create ripples in Earth's atmosphere called gravity waves. These waves make the airglow structure visible, especially in long-exposure photographs taken along the vertical walls of the airglow.
The Sun on 18 April 2021
NASA SDO took this picture on 18 April 2021, 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 18 April 2021 See it as a poster -
The Earth on your day The Earth on 18 April 2021 · Gobi Desert See it as a poster -
Released on 18 April 2013 Star Factory Messier 17 See it as a poster -
Released on 18 April 2011 Hubble peers through the looking glass See it as a poster -
Released on 18 April 2016 The International Space Station over Earth See it as a poster -
Released on 18 April 2015 The Great Crater Hokusai See it as a poster -
Released on 18 April 2022 Hubble Inspects a Set of Galactic Wings See it as a poster
In tropical astrology, 18 APR 2021 falls under Aries (♈). The sign's window runs from 03-21 through 04-19. Aries is the constellation traditionally tied to spring's arrival in the northern hemisphere. The Sun was crossing this region of the sky on 18 APR 2021.
Questions about April 18, 2021
What space photo was released on April 18, 2021?
NASA's Astronomy Picture of the Day for April 18, 2021 was "Rainbow Airglow over the Azores". 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 April 18, 2021?
A first quarter moon, about 38% lit.
What day of the week was April 18, 2021?
April 18, 2021 was a Sunday, day 108 of the 365 days in 2021.
What did the Sun and the Earth look like on April 18, 2021?
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.