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.

2022 September 3
See Explanation. Clicking on the picture will download
the highest resolution version available.

Sun and Moon and ISS
Image Credit & Copyright: Wang Letian (Eyes at Night), Jin Ma (Beijing Planetarium)

Explanation: On August 25 Sun and Moon could both be seen in planet Earth's daytime skies. And so could the International Space Station. The ISS crossed the disk of the waning crescent Moon as seen from Shunyi district, Beijing, China at about 11:02 am local time. Some 40 kilometers to the southwest, in Fengtai district, the ISS was seen to cross the Sun's disk too. The solar transit was observed only 29 seconds later. Both transits are compared in these panels, composed of processed and stacked video frames from the two locations. The coordinated captures were made with different equipment, but adjusted to show the Sun and Moon at the same scale. The ISS was at a calculated range of 435 kilometers for the lunar transit and 491 kilometers when passing in front of the Sun.

Artemis I: Launch Update
Tomorrow's picture: sea and sky < | Archive | Submissions | Index | Search | Calendar | RSS | Education | About APOD | Discuss | >

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
NASA Web Privacy Policy and Important Notices
A service of: ASD at NASA / GSFC,
NASA Science Activation
& Michigan Tech. U.


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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.

2022 September 4
The featured image shows rock outcrops off the coast of
Oregon, USA, with blue bioluminescence in the water and the central
band of our Milky Way galaxy in the sky.
Please see the explanation for more detailed information.

Sea and Sky Glows over the Oregon Coast
Image Credit & Copyright: Rudy Montoya

The sand became blue when every step was taken. The blue glow was bioluminescence, a blue radiance that also lights the surf in this scene. Volcanic stacks dot the sea while a thin fog layer scatters light. The orange light on the right horizon came from a fishing boat, while the rays of light on the left horizon came from car headlights. The band of our star is visible far in the distance. The images were added to the background to make it easier to hear.

Your Sky Surprise: What picture did APOD feature on your birthday? (post 1995)
Tomorrow's picture: space cliffs

< | Archive | Submissions | Index | Search | Calendar | RSS | Education | About APOD | Discuss | >

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
NASA Web Privacy Policy and Important Notices
A service of: ASD at NASA / GSFC,
NASA Science Activation
& Michigan Tech. U.