The sky on
your birthday.
Equinox Sunset
The Sun sets in a slightly different direction every day. While it always sets approximately to the west, on an equinox it sets due west. After the September equinox, the Sun will set increasingly to the southwest, reaching its maximum displacement at the December solstice. Before the equinox, it set to the northwest.
Heavy matte paper, about 200 gsm, printed in the United States and shipped free. The card stays free, the print is the thing you keep.
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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 September 2025 See it as a poster -
The Earth on your day The Earth on 21 September 2025 · Italy and the Adriatic See it as a poster -
Released on 21 September 2010 A Nebula by Any Other Name See it as a poster -
Released on 21 September 2010 In the Grip of the Scorpion Claw See it as a poster -
Released on 21 September 2015 Spiral Galaxy M96 from Hubble See it as a poster -
Released on 21 September 2020 Dark Matter Surplus See it as a poster -
Released on 21 September 2022 Neptune Wide-Field (NIRCam Image) See it as a poster
In tropical astrology, 21 SEP 2025 falls under Virgo (♍). The sign's window runs from 08-23 through 09-22. Virgo is the largest zodiac constellation, holding the heart of the Virgo galaxy cluster. The Sun was crossing this region of the sky on 21 SEP 2025.
Questions about September 21, 2025
What space photo was released on September 21, 2025?
NASA's Astronomy Picture of the Day for September 21, 2025 was "Equinox Sunset". It's the card at the top of this page.
What was the Moon's phase on September 21, 2025?
A new moon, about 1% lit.
What day of the week was September 21, 2025?
September 21, 2025 was a Sunday, day 264 of the 365 days in 2025.
What did the Sun and the Earth look like on September 21, 2025?
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.