USPS SIGHT REDUCTION FORM (click here for help)
Name
SR 96a
Squadron
TIME
Date
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
WT
-
-
WE
f-
s+
-
ZT
-
-
ZD
UT
-
-
G Day/Month
SIGHT DATA
Sight No.
Body
Sun LL
Sun UL
Moon LL
Moon UL
Mars
Venus
Jupiter
Saturn
Star
DR L
°
´
N
S
DR Lo
°
´
W
E
ALTITUDE
Ht of eye
ft
hs
°
´
( + ´ )
( - ´ )
IC
Dip
Total
Corr
ha
°
´
(moon only)
HP
°
´
( + ´ )
( - ´ )
Main
Add´l, Pl
UL´-30.00´
Add´l, Ref
Total
Corr
ho
°
´
ALMANAC --- LHA
SHA *
°
´
hr
°
´
min
sec
°
´
v (
-
+
)
´
v corr (
)
´
Tot GHA
°
´
Dr Lo
°
´
LHA
°
´
ALMANAC --- Dec
Dec
hr
°
´
N
S
d (
-
+
)
´
d corr (
)
´
Dec
°
´
INTERCEPT and AZIMUTH by the LAW of COSINES METHOD
Enter Lat as positive.
If Lat/Dec contrary name
enter Dec as negative.
Convert LHA, Lat, and Dec to
5 place rounded decimal degrees.
Round Zn to whole degrees.
LHA
°
´
-----> LHA
°
Lat
°
´
-----> Lat (+)
°
Dec
°
´
-----> Dec
°
( cos LHA x cos Lat x cos Dec ) + ( sin Lat x sin Dec ) = sin Hc
°
( sin Dec - ( sin Lat x sin Hc ) / ( cos Lat x cos Hc ) = cos Z
°
Hc
°
´
Ho
°
´
Ho > Hc...toward
a
nm
Hc > Ho...away
Zn
°