Tonight's Sky
Sun
Sun
Moon
Moon
Mercury
Mercury
Venus
Venus
Mars
Mars
Jupiter
Jupiter
Saturn
Saturn

Tonight's Sky — Change location

OR

Searching...

Tonight's Sky — Select location

Tonight's Sky — Enter coordinates

° '
° '

The Solar Dynamics Observatory observes Earth, lunar transits in same day

On March 11, Earth blocked the observatory’s view of the Sun, and later in the same day, the Moon moved in front of our star for a partial eclipse.
RELATED TOPICS: SOLAR SYSTEM | SUN | MOON
SDOEarthEclipse-LunarTransit2013
The view of the sun (left image) is partially obscured by Earth as seen by NASA’s Solar Dynamics Observatory on March 11, 2013, at 2:20 a.m. EDT. The image on the right from NASA’s Solar Dynamics Observatory on March 11, 2013, at 8:00 a.m. EDT, shows the Moon crossing in front of the Sun. // NASA/SDO
On March 2, 2013, NASA’s Solar Dynamics Observatory (SDO) entered its semiannual eclipse season, a period of three weeks when Earth blocks its view of the Sun for a period of time each day. On March 11, however, SDO was treated to two transits. Earth blocked SDO’s view of the Sun from about 2:15–3:45 a.m. EDT. Later in the same day, from around 7:30–8:45 a.m. EDT, the Moon moved in front of the Sun for a partial eclipse.

When Earth blocks the Sun, the boundaries of Earth’s shadow appear fuzzy, since SDO can see some light from the Sun coming through Earth’s atmosphere. The line of Earth appears almost straight, since Earth, from SDO’s point of view, is so large compared to the Sun.

The eclipse caused by the Moon looks far different. Since the Moon has no atmosphere, its curved shape can be seen clearly, and the line of its shadow is crisp and clean. Any spacecraft observing the Sun from an orbit around Earth has to contend with such eclipses, but SDO's orbit is designed to minimize them as much as possible, with only two three-week eclipse seasons each year. The 2013 spring eclipse season continues until March 26. The fall season will begin September 2.

0

JOIN THE DISCUSSION

Read and share your comments on this article
Comment on this article
Want to leave a comment?
Only registered members of Astronomy.com are allowed to comment on this article. Registration is FREE and only takes a couple minutes.

Login or Register now.
0 comments
ADVERTISEMENT

FREE EMAIL NEWSLETTER

Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter.

ADVERTISEMENT
ADVERTISEMENT
BoxProductcovernov

Click here to receive a FREE e-Guide exclusively from Astronomy magazine.

Find us on Facebook

Loading...