Home

Site Map

Search

navigation,astronomy,software,applet,java,sun,moon,java,applet,lunar distance
GeoAstro
Applets

Astronomy
navigation,astronomy,software,applet,java,sun,moon,java,applet,lunar distance
Chaos Game
navigation,astronomy,software,applet,java,sun,moon,java,applet,lunar distance
Java
navigation,astronomy,software,applet,java,sun,moon,java,applet,lunar distance
Miscel-

laneous
navigation,astronomy,software,applet,java,sun,moon,java,applet,lunar distance
Physics Quiz
navigation,astronomy,software,applet,java,sun,moon,java,applet,lunar distance
Who is
Who ?

Applet

Navigation by Lunar Distance


Nautisches Jahrbuch Nautical almanac 1914      Americab Ephemeris 1911


Lunar distance Nautical Almanach Nautisches Jahrbuch     American lunar table

Comparison of the results for Lunar Distance 1914 January:


Jan 01, 12:00 UT
Jan 06, 12:00 UT Jan 20, 12:00 UT
Almanac 56° 59' 08''
111° 15' 53'' 70° 57' 03''
MICA 56° 59' 19'' 111° 16' 06'' 70° 56' 55''
Planets applet 56° 59' 22'' 111° 16' 04'' 70° 56' 57''

lunars

The MICA results (USNO Multiyear Interactive Computer Almanac) are computed from
the precise apparent geocentric latitudes and longitudes (True Equinox and Ecliptic of Date) using the formula:

formula angular lunar distance

The error is <3'' for the Planets applet, <=13'' for the 1914 Almanac.

The Planets applet is using the most important terms (J. Meeus: Astronomical Alorithms) of the VSOP 87 theory
(error in latitude, longitude: Sun <1'', Moon: <10'', <4'').

American Ephemeris

Comparing 41 Lunar Distances the mean difference between the "American Ephemeris and Nautical Almanac for the Year 1911" and my Planets applet (using ∆T=ET-UT=0) is only 1.7''.


Lunar distance applet

Lunar distance
The lunar distance data window is available from the "Write/Draw" menu for the Sun, and the bright planets.



More features of the Planet Applet are described here

Web Links

Lunar distance (navigation) (Wikipedia)

Parallax (Wikipedia)

A Short Guide to Celestial Navigation (PDF, Henning Umland)

About Lunars

Longitude by Lunars

Angular Distances between two celestial objects and Lunar Calculation

Updated: 2010, Sep 15

© 2010 J. Giesen

email