The sky on
your birthday.
Solar Sail
For nearly 400 years, the idea of solar sailing has captivated astronomers. Johannes Kepler first suggested that vessels might navigate space using sails, much like comet tails are blown by a solar breeze. Sunlight does produce a force, and a large, reflective sail could propel a spacecraft. This illustration represents a concept explored by NASA for such a mission, showing the potential of this futuristic propulsion.
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 Earth on your day The Earth on 21 August 2004 · Lake Eyre, Australia See it as a poster -
Released on 21 August 2023 Webb captures detailed beauty of Ring Nebula (NIRCam image) See it as a poster -
Released on 21 August 2023 Webb captures detailed beauty of Ring Nebula (NIRCam image - cropped) See it as a poster -
Released on 21 August 2023 Webb captures detailed beauty of Ring Nebula (MIRI image - cropped) See it as a poster -
Released on 21 August 2023 Hubble’s view of the Ring Nebula (2013 image - cropped) See it as a poster -
Released on 21 August 2017 2017 Total Solar Eclipse See it as a poster
In tropical astrology, 21 AUG 2004 falls under Leo (♌). The sign's window runs from 07-23 through 08-22. Leo is anchored by Regulus, the heart of the Lion, twenty-four parsecs from Earth. The Sun was crossing this region of the sky on 21 AUG 2004.
Questions about August 21, 2004
What space photo was released on August 21, 2004?
NASA's Astronomy Picture of the Day for August 21, 2004 was "Solar Sail". It's the card at the top of this page.
What was the Moon's phase on August 21, 2004?
A waxing crescent moon, about 30% lit.
What day of the week was August 21, 2004?
August 21, 2004 was a Saturday, day 234 of the 366 days in 2004.
What did the Sun and the Earth look like on August 21, 2004?
NASA's Terra satellite photographed the whole Earth that day. It's 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.