Prog 1 Flashcards
Perihelion
Closest to sun
Early January
Aphelion
Furthest from sun
Early July
Nautical mile breakdown
6076 ft
1852 m
1.15 statute miles
Statute mile
5280 ft
Kilometre
3280 ft
1000 m
Departure distance equation
Chlong x 60 x cos(latitude)
Variation
Magnetic to true
East (+) magnetic less than true
West (-) magnetic is more than true
Isogonals
Lines joining places with equal variation
Agonal
Lines joining places with 0 variation
Deviation
Difference in compass and magnetic (run DMC)
East compass less than magnetic
West compass more than magnetic
Relative bearing
Based on axis of aircraft
Equinox
Sun over equator
March and September
Solstice
Sun over tropics
December 21 June 21
Hour and minute in degrees
1 hour 15°
4 minutes 1°
LMT
Transit of sun over observer
0000 when sun over anti meridian of observer
GMT
Same as UTC
Z
East of gmt lmt is ahead
West of gmt lmt is behind
Zone time
15° sections best off gmt
Calculated based on hours added from lmt to utc
A-M east
N-Y west
Nzdt
UTC +13
Last Sunday in September —> first sun April
Sensible horizon
34’ below visual horizon
Same as celestial
Declination at equinox and solstice
0° at equinox
23.5° solstice
Increasing vs decreasing declination
Movement in relation to equator/latitude
Increasing going away from equator
Civil twilight
Centre of sun 6° below horizon
Nautical twilight
6-12 below horizon
Astronomical twilight
12-18 below horizon
Earths rotation around sun viewed from North Pole
Anticlockwise and and elliptical
Difference between equinoctial and ecliptic
23.5°
Sidereal day
Based on observation of celestial body
Shorter than solar day
Maximum difference between mean noon and real/apparent noon
November and February
Maximum difference between mean and apparent time
16 minutes
Length of sidereal year
365 days 6hours
Leap year
Every 4 years except centuries not divisible by 4
