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Solar System Events Synopsis Calculator

Submitted on: 5/1/2019 12:33:52 PM
By: Jay Tanner  
Level: Advanced
User Rating: Unrated
Compatibility: PHP 7.0
Views: 152
Language PHP v7.1.8
Author: Jay Tanner - 2019

This program displays a synopsis of dates and times of basic solar system
events for any given year over the 600-year period from 1600 to 2200. It
covers the moon, the sun, the eight major planets and Pluto.
The positional computations, from which the dates and time were computed, are
based on the NASA/JPL DE405 ephemeris and the IAU 2000B theory of nutation,
referred to the true ecliptic, equator and equinox of the date.
The remote Delta T estimates are computed from the NASA polynomial expressions
and resolved to the nearest second. The greatest uncertainty lies in the value
of the Delta T, which can only be estimated for remote dates based on observed
past trends and current observations.
The dates and times of the solar and lunar eclipses and solar transits of the
planets Mercury and Venus are based on the work of Fred Espenak, NASA GSFC
Emeritus, and refer to the times of mid-event or a maximum point. Only the
general times of the events are computed, not the finer details, since this
program is only a general synopsis of basic events for the given year. When
you want a basic schedule of solar system events for any given year, this
program serves as a handy quick reference.
LT = Local Time for any time zone offset from UT
UT = Universal Time (UT1, GMT)
TT = Terrestrial Time = Atomic-based ephemeris time used in astronomy
Static ephemeris tables that are computed for TT do not necessarily coincide
with your local date and time of an event. To remedy this, the program will
allow the user to adjust for any local time zone offset from UT as needed.
Solar System Event Event Description
------------------ ----------------------------------------------------------
New Moon      Moon at phase angle 0/360 deg
First Quarter Moon Moon at phase angle 90 deg
Full Moon      Moon at phase angle 180 deg
Last Quarter Moon  Moon at phase angle 270 deg
Penumbral Eclipse  Moon passes through faint outer shadow, barely apparent
Partial Eclipse   Moon passes only partially through darker inner shadow
Total Eclipse    Moon passes totally within the darker inner shadow
Lunar Perigee    Moon at minimum orbital distance from Earth
Lunar Apogee    Moon at maximum orbital distance from Earth
Total Solar Eclipse   Solar disk totally covered by lunar disk
Partial Solar Eclipse  Solar disk partially covered by lunar disk
Annular Solar Eclipse  Lunar disk forms ring passing over solar disk
Hybrid Solar Eclipse  Starts as annular, ends as partial or vice versa
Perihelion     Earth or planet at minimum orbital distance from Sun
Aphelion      Earth or planet at maximum orbital distance from Sun
Planetary Perigee  Closest planetary approach to Earth. There could be more
          than one perigee in a year, depending on the planet. Each
          year, every planet has at least one perigee or point of
          closest approach.
Planetary Apogee  Greatest planetary distance from Earth. There could be
          more than one apogee in a year, depending on the planet.
March Equinox    Beginning of Northern Spring and Southern Autumn
June Solstice    Beginning of Northern Summer and Southern Winter
September Equinox  Beginning of Northern Autumn and Southern Spring
December Solstice  Beginning of Northern Winter and Southern Summer
Mercury Transit   Planet Mercury slowly passes across the face of the sun.
Venus Transit    Planet Venus slowly passes across the face of the sun.
A working copy of the program can be found here.

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