Equinox of the position
as supplied to the heasarc was 2000.
Specify the equinox
of the input coordinates, all coords are output as j2000.
The same happens at the spring or
vernal equinox
on the 21st march.
Equinox j2000
) of the euv source.
From the
autumn equinox
the setting sun moves gradually south along the western horizon.
Note that the coordinates in the file
use the 1975 equinox.
September 21 was the " official " date of the
autumnal equinox.
Equinox points, in an angle of 60 deg - a sextile!
Dec the declination of the target in the
default equinox.
We choose a fixed point on the celestial equator,
called the vernal equinox, or the first point of aries.
Dec the declination of the object in the
selected equinox.
Equinox conditions
during solar minimum.
In fact, on the days of the spring and
fall equinox
the length of daylight is actually longer than darkness by several minutes.
Ra the nominal right ascension of the xmm-newton pointing, in the
requested equinox.
Ra the ra of the supernova in the
specified equinox.
Equinox year
).
Output equinox: give stellar co-ordinates in j2000 or b1950 epoch.
Around march 21, the sun is in the middle of its swing and will rise at due east,
marking the vernal equinox.
Ecliptic and equatorial co-ordinates are referred to the
mean equinox
of a given epoch.
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