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Astronomy Picture of the Day
The Equal Night
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#70357
by
[z]Barbara Harris
@
21.03.2005 00:00
- nach oben -
The Equal Night
Explanation: Today,
the Sun crosses
the celestial equator heading north, marking the
Vernal Equinox
-- the first day of spring in the Northern Hemisphere and autumn in the
south
. Equinox means equal night and with the Sun
on the celestial equator
,
Earthlings
will experience 12 hours of daylight and 12 hours of darkness. For
those
in the
Northern Hemisphere
, the days will continue to grow longer with
the Sun marching higher
in the sky as summer approaches. A few weeks after the northern Autumnal
Equinox
of 1994, the Crew of the
Shuttle Endeavor
recorded this image
of
the Sun poised
above the Earth's limb. Glare illuminates Endeavor's vertical tail (pointing toward the Earth) along with
radar equipment
in the payload bay. The
space shuttle
is expected to return to flight later this year with the launch of
STS-114
.
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