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Current date and time. For given geographical position shows the
current local date and time, universal date and time, cuurent siderial time.
Daylight savings time is also taken into account. |
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Calendar for a year. Shows the calendar for a given year. Source of
the script: http://javascripts.boom.ru/calendar.htm,
modified by N.Alexandrovich. |
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Universal date converter. Inputs date and time in any of 10 formats
(usual date and time, decimal day, decimal number of day of year, decimal year,
several types of Julian Days). Converts from any format to all the rest and
shows the day of week. Direct input of current date and time in also provided,
time zone correction is made. |
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Distance between two points. Calculates angular distance between
two points on the celestial sphere with given coordinates. Accepts
hh:mm:ss & o:':", decimal degrees and radians. |
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Source visibility for a year. For a given observing location
calculates height above horizon of a source with given equatorial coordinates
for every hour within a given range of dates. Also marks the dark time of night,
presence of the Moon at a phase higher than specified and proximity of the
Moon to the source closer than by acceptable distance. |
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Precession correction. Converts equatorial coordinates from one
given epoch to the other and determines the constellation in which this point
is located. |
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Universal coordinates converter. Precession correction and mutual
conversion between equatorial, ecliptical and galactic coordinates. Shows all
coordinates and inclination angle of ecliptics to equator for two epochs,
determines the constellation. |
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Atmospheric refraction. Correction of source altitude and its
zenith angle for atmospheric refraction. Converts astrometric position to
the apparent one and vice versa.
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Astrophotomery. Calculation of stellar magnitudes from flux ratio
and backwards. Determining the visual and absolute magnitudes, luminocity,
distance (parallax) and extinction.
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