longitudes
latitudes
rivers
direction of winds
A narrow belt of land
A mountainous island
A piece of land surrounded by water on three sides
A range of hills
40000 km
4000 km
50000 km
5000 km
Perigee
Apogee
Perihelion
Aphelion
spiral
elliptical
circular
spherical
Light year
Nautical mile
Statute mile
Kilometre
11 years
15 years
21 years
33 years
Moon's period of rotation on its axis with respect to the earth.
Moon's period of revolution around the earth.
Moon's period of revolution with respect to a star at infinity
Moon's period of revolution with respect to the Sun
Siderial Year
Solar Year
Cosmic Year
Leap Year
Carbondioxide and sulphuric acid
Carbondioxide and nitric acid
Nitrogen and sulphuric acid
Nitrogen and nitric acid
Quasars
b) Pulsar
Aurora Borealis
White Dwarfstar
December 25
March 21
February 28
January 14
21,000 km
16,800 km
18,600 km
12,500 km
December-22
March-21
June-21
September-23
A bay
A gulf
A strait
An isthmus
Venus
Earth
Mars
Uranus
Jupiter
Mars
Saturn
Uranus
Earth
Jupiter
Mercury
Venus
Uranus
Venus
Mars
Pluto
Venus
Uranus
Pluto
Earth
17214 km
12741 km
12714 km
17124 km
Moon
Ganymede
Europa
Cheron
Venus
Uranus
Mercury
Mars
Titania
Titan
Miranda
Europa
Day and night
Varying lengths of day and night at different times of the year
Differences in time between places on different meridians
The deflection of winds
Pulsars
Quasuars
Neutron stars
All of the above
Solar System
Universe
Space
Constellation
Moon
Asteroid
Satellite
Great Bear
Revolution
Rotation
Inclination of the earth's axis
Geoid shape of the earth
Position of the Sun during summer solstice
Position of the vertical Sun during winter solstice
A star showing the position of the South Pole
Point of intersection of Antarctic Circle and the Prime Meridian