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Generates Monthly calendar for every desired place and time.
Includes: Moon phase, Julian day, sidereal time, Sun Rise/Set,
Moon Rise/Set and Moon equatorial position.
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Given the instrument zeropoint, extinction coefficient,
gain, read out noise, bias level, sky brightness, etc.
estimate the exposure time needed
to image a point like source with a given magnitude and a given S/N.
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Convert a given date to Julian day and day of week.
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Given the observer position, convert R.A, Declination and
sidereal time to azimuth and altitude.
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Estimate the atmospheric refraction of an object as function of
the object altitude, the air pressure and temperature.
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Convert Solar longitude in equinox J2000.0 to Julian day and date.
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Calculate the Gegenschein equatorial position (valid from 1950 to 2050).
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Generate monthly maps of the sky visible from Israel.
Includes stars to magnitude 4.5, with their spectral type coded
in color (without planets).
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List of primary Moonphases from 1950 to 2060.
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