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Longitude by Chronometer SUN

This document contains instructions and formulas for calculating longitude using a chronometer and celestial observations of the sun. It includes tables for recording date, time, latitude, longitude, declination, altitude corrections, and azimuth. Formulas are provided to calculate true altitude, Greenwich hour angle of the sun, local hour angle, and observed and true longitude using trigonometric functions of latitude, declination, and observed altitude.

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Bandar Almalki
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552 views1 page

Longitude by Chronometer SUN

This document contains instructions and formulas for calculating longitude using a chronometer and celestial observations of the sun. It includes tables for recording date, time, latitude, longitude, declination, altitude corrections, and azimuth. Formulas are provided to calculate true altitude, Greenwich hour angle of the sun, local hour angle, and observed and true longitude using trigonometric functions of latitude, declination, and observed altitude.

Uploaded by

Bandar Almalki
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Longitude by chronometer SUN

Day Hrs Min Sec AM Lat


GMT
PM Long

Deg Min Deg Min N/S


Sext. Alt Declination
Off (+) d( )
I.E
On (--) Declination
Obs. Alt
Dip ( ) H.E. Deg Min
GHA Sun
App. Alt INC +
Total Corr. UL/LL GHA Sun
True Alt

Sin T. Alt +/- Sin Lat. X Sin Declination (-) Lat and dec same names
Cos P = (+) Lat and dec opp names
Cos Lat. X Cos Declination

Deg Min Deg Min LHA = P after mer pass i.e. PM


LHA =360 – P before mer pass i.e AM
P= LHA =
GHA = E/W Subtract small from big
GHA best longitude west
Observed LONG = GHA least longitude east

Tan Lat Named Opposite to


A=
Tan P latitude

Tan Dec Named same as


B=
Sin P declination

A+B Same names A & B N/S same as C


C=
A-B Different names A & B E if AM
W if PM
1 N/S E/W
Tan Az = Az =
C X Cos Lat
(N—E 000 + Az),(S --- E 180 – Az),( N --- W 360 – Az), (S --- W
True Az
180 + Az)
90 + True Az
PL
(90 + True Az) + 180

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