Advanced Navigation

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Advanced Navigation
Local Apparent Noon
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Objectives
1. To gain an understanding of how the
observation of a celestial body yields a
line of latitude. 2. To become familiar with
the procedure of determining latitude by
Local Apparent
Noon.
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REMEMBER ME?
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WHAT ARE YOU GOING TO DO IF YOU ARE IN THE
SOUTHERN HEMISPHERE ?
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(No Transcript)
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I WILL USE LOCAL APPARENT NOON
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REMEMBER THAT THERE ARE TWO EASY WAYS TO GET THE
LATITUDE!

• LATITUDE BY POLARIS
• LOCAL APPARENT NOON

THESE TWO WAYS ARE SPECIAL CASES OF THE
NAVIGATION TRIANGLE
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BUT FIRST

• What is a meridian?
• How many meridians exist?
• Define local observers meridian.

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-S-
-E-
-W-
-N-
LOCAL OBSERVERS MERIDIAN
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ELEV. POLE
CEL. BODY
ZENITH
EQUATOR
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ELEV. POLE
CEL. BODY
ZENITH
EQUATOR
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COLATITUDE
POLAR DISTANCE
COALTITUDE
EQUATOR
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COALTITUDE
LATITUDE
DECLINATION
EQUATOR
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NOON
LOCAL OBSERVERS MERIDIAN
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NP
NP
EQUATOR
-Z-
-Z-
EQUATOR
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HOW TO GET WHAT YOU NEED?
DECLINATION From the nautical almanac. COALTITUD
E 90º - Altitude.
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Altitude
HORIZON
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THERE ARE THREE DIFFERENT CASES OFLAN

• WE HAVE SEEN THE FIRST

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1ST CASE
NP
NP
-Z-
EQUATOR
-Z-
EQUATOR
LATITUDE (90º - ALTITUDE) DECLINATION
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2ND CASE
NP
NP
EQUATOR
Z
-Z-
EQUATOR
LATITUDE DECLINATION - (90º - ALTITUDE)
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3RD CASE
NP
NP
EQUATOR
-Z-
Z
EQUATOR
LATITUDE(90º - ALTITUDE) - DECLINATION
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Questions?
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Compliments of Curtis Senior High School NJROTC