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-
- Version 1.0
-
- This Program computes information relating to the position, distance,
- magnitude, etc for the major planets on a specified date and time.
- Refer to PRACTICAL ASTRONOMY WITH YOUR CALCULATOR by Peter Duffett-Smith
- for the calculation methods.
-
- This program is placed in the public domain "as is".
-
- Comments may be sent to the author:
-
- Larry Puhl
- 6 Plum Court
- Sleepy Hollow, Ill. 60118
-
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-
- Glossary of Terms
-
-
- Azimuth : The angle from the North measured East to West. When
- applied to set and rise times for a planet this
- indicated where on the horizon, 180 deg. for South,
- 270 deg. for West, etc.
-
- Daylight Savings : If Daylight savings time is enabed then the local time
- is advanced one hour on the last Sunday in March and
- set back on the last Sunday in October.
-
- Ecliptic Coordinates : Are related to the earths orbit, Long is the
- angle around from the first point of Aries
- and Lat is angle Up or Down
-
- Equatorial Coord. : Are related to the earths equator, DEC is how
- far north or south of the equator and RA is
- angle around the equator from the first point
- of Aries
-
- First Point of Aries : This direction remains fixed with respect to the
- stars (except for Precession) and is used as a
- reference for ecliptic and equatorial coordinates.
-
- GMT : Greenwich Mean Time, time at longitude 0 deg.
-
- GST : Greenwich mean sideral time, is related to the
- position of of the stars rather than the Sun.
-
- JD : Julian Day Number is the number of days since
- January 1st 4713 B.C.
-
- HA : Hour Angle is the time since the planet crossed
- the meridian
-
- helio ecliptic lat. : Angle north or south of the earths orbit
-
- heliocentric long : Angle from the first point of Aries that planet
- makes round the sun
-
- Horizontal Coord. : Are related to the observers horizon, Alt is
- angle above the horizon and Azim is angle from
- the north going east.
-
- Lat : Latitude of observing site
-
- LCT : Local Civil Time (time locally used)
-
- LST : Local Sideral Time, is related to the
- position of of the stars rather than the Sun.
-
- Long : Longitude of observing site
-
- long of ascend node : The point where a planet rises out of the plane of
- the ecliptic
-
- Mag : Magnitude on a logrithmic scale which measures the
- brightness of the planet ( the calculation here is
- accurate to only 1 or 2
-
- mean anomaly : Angle a fictitious planet, moving in a circle,
- would make with a line from the sun to the
- planets perihelion
-
-
- Phase : Area of the disc which is illuminated
-
- true anomaly : Corrects the mean anomaly to account for the
- eccentricity of the orbit
-
-
- radius vector : Distance from the Sun to the planet
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