Solution:
The position of the sun is annually twice overhead at Singapore because of the parallelism of inclined axis of the earth.

Solution:
The latitude of a place expresses its angular position relative to the plane of equator.

Solution:
Null Island is a name for the area around the point where the prime meridian and the equator cross, located in the Gulf of Guinea (South Atlantic Ocean) off the west African coast. It has geographical position of 0° latitude and 0° longitude

Solution:
The approximately diameter of Earth is 12800 km. The rotation of the planet has slightly flattened it out, so it has a larger diameter at the equator than at the poles. The equatorial diameter of Earth is 12,756 km, its polar diameter is 12,713 km, and its average diameter, which is referred to in common usage, is 12,742 km or 7,926 miles.

Solution:
The earth is tilted on its axis, because of which very poor sunlight is allowed to reach the north and south poles. When the north pole is tilted towards the sun,it experiences continuous day light for six months. And when the pole is tilted on the other side, it experiences continuous night for six months.

Solution:
While longitudes are imaginary lines running from north to south pole and parallel to prime meridian. In total they are 360 in number. Longitudes are 360 and latitudes are 181.

Solution:
The torrid zone refers to the area of the earth between the Tropic of Cancer and the Tropic of Capricorn.