Earth, lunar transits observed on same day
Washington: NASA`s Solar Dynamics Observatory (SDO) entered its semi-annual eclipse season on March 2, 2013 - 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 to 3:45 am EDT.
Later in the same day, from around 7:30 to 8:45 am 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 on September 2.
More from India
More from World
More from Sports
More from Entertaiment
- Bird flu grips nation, Delhi worst affected
- DNA: Exclusive report on the extreme sacrifices made by ITBP soldiers
- I pay my tribute to martyr Naresh Pal: PM Narendra Modi
- How will the rift in Samajwadi Party affect UP politics?
- Some people are creating confusion between me and my father: Akhilesh Yadav
- India vs New Zealand, 3rd ODI: As it happened...
- This is why Cyrus Mistry was removed as Chairman of Tata Sons!
- Prompt action on border pushes Pak to offer olive branch, says both sides need to 'formalise' 2003 ceasefire
- Read letters by Ratan Tata to PM Narendra Modi and Group employees after Cyrus Mistry's ouster
- 7th Pay Commission: Committee on Allowances proposes hike in HRA for central govt employees