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Flashcards in Introduction Deck (13):
1

Solstice and dates

Point at which the sun is at its highest point or lowest point in the sky
Sun is directly over the Tropic of Cancer
Longest day in either n or s
Continuous day in either arctic circle depending on date
21st June
21st of December

2

Perihelion

December - January
Orbital velocity is highest
Earth is closest to the sun

3

Aphelion

June
Orbital velocity is lowest
Sun is furthest away from the sun

4

Equinox and dates

Sun directly overhead the equator
Equal day and night
March equinox - 20/21 march
September equinox - 22/23rd September

5

Earth orbits around

Plane of the ecliptic

6

Equator vs the plane of ecliptic

23.5*

Causes seasons

7

Greatest difference between the apparent noon and the mean noon

Between Feb and nov

8

Shape of the earth

Oblique/oblique spheroid

9

Ratio of ellipticity

1/298 or 1/297

10

Circumference of the equator

21,600nm

40,000km

11

Distance from the equator to the poles

5400nm

10,000km

12

Diameter of the earth

12732.4 km
6874.9 nm

13

Radius of the earth

3437.47nm

6322.2km