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Flashcards in Facts For Exam Deck (18):
1

Kepplers laws

Elliptical orbits - earth is at 1 foci
Equal areas are swept in equal time

2

Semi minor/major axis

Minor = 6357km

Major = 6378km

3

Latitude of Capricorn

23.5 south

Cancer 23.5N

4

Arctic/ Antarctic circle

66 33N/S

5

Angle of inclination

23.5

6

Aphelion

3 July

7

Perihelion

3 Jan

8

Summer/winter solstice

Summer - 21 June

Winter - 21 December

9

Equinoxes

Spring - 21 march

Autumn - 21 September

10

Leap years

1 every 4 years

Skip one 3 times in 4 centuries

11

Max rate of change of equinoxes

3mins per day

12

Analemma

Apparent sun

13

Sunrise

Upper limb breaks the horizon

14

Sunset

Upper limb drops below the horizon

15

Dusk/dawn

Centre of the sun 6 degrees below the horizon

16

Direct Mercator

Conformal
Scale expands from equator
No chart convergence
Rhumb lines are straight
GC are concave to the equator

17

Lamberts conformal

Conformal
Scale decreases inside the standard of parallels
Scale increases outside the standard of parallels
Rhumb lines are concave to the pole
GC are straight - sort of concave to the PO
Convergence = sinPO

18

Polar stereographic

Conformal
Convergence = CHlong
Scale expands away from the pole
GC are straight lines
Rhumb lines are curved lines in concentric (ellipses) circles