Verification of JAVA Celestial Navigation paper calculation: 3 star solution

RLM 29 Jan 2004

JD given y,m,d,ut (Meeus p. 61-62)

Define ancilliary variables, function definitions, constants

Equation 11

Define xyz -> long-lat (not in paper)

xyz to geocentric latitude

GMST (radians) at 0h UT (AA B6)

xyz to longitude

Define some handy functions at right (GST0, JD)

Epoch of observation: 19 Feb 2004 at 20 UT

Equation 1

Star positions

Zenith angles derived from test case:
F = 35.000N, l = 75.000E

1. Positions, observed zenith angles for three stars from Megastar

solution

sitions, observed zenith angles for first pair of stars from Table1

Calculate A-F variables, equations

Equation 14

Equation 15a,b

First solution

trial value

Second solution

trial value

1. Positions, observed zenith angles for first pair of stars from Table1

Calculate A-F variables, equations

Equation 14

Equation 15a,b

First solution

trial value

Second solution

trial value

1. Positions, observed zenith angles for first pair of stars from Table1

Calculate A-F variables, equations

Equation 14

Equation 15a,b

First solution

trial value

Second solution

trial value

1. Positions, observed zenith angles for first pair of stars from Table1

Calculate A-F variables, equations

Equation 14

Equation 15a,b

First solution

trial value

Second solution

trial value

1. Positions, observed zenith angles for first pair of stars from Table1

Calculate A-F variables, equations

Equation 14

Equation 15a,b

First solution

trial value

Second solution

trial value