cycle with two eclipse seasons
lasting 100 years each.
The four battery packs on board, which are comprised of VES 140S cells, will power the satellite during the two 45-day eclipse seasons
each year while in orbit.
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.
Washington, Mar 12 ( ANI ): 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.
Even when conditions are exactly right, which happens about once in every three eclipse seasons (18 months), the total eclipse can be seen from only a very narrow "band of totality"--a few tens of miles wide--that crosses an entire hemisphere of Earth in one day.
During nearly every eclipse season, there is a partial or total solar eclipse somewhere in the world.
It also finds eclipse seasons
, positions and distances of the Sun and Moon for any moment, times and distances of perigee and apogee, and more.
Using this model, we can also explain the more difficult concept of eclipse seasons
, in which eclipses are bunched together at half-year intervals.
Mitsuru Soma (National Astronomical Observatory, Tokyo), who called attention to the current eclipse season
, is urging suitably equipped astronomers to make photometric timings.