| What is the shape of the path in which the earth moves around the sun An elliptical path. |
| What is a leap year ? Such a year which has 366 days, is called a leap year. Every fourth year is a leap year. The month of February has 29 days instead of 28 in a leap year. |
| On which day all places on the northern hemisphere have the longest day and the shortest night ? On 21th June. |
| On which day, all places on the southern hemisphere have the longest day and the shortest night? 22nd December |
| What is autumnal equinox ? On September 23, days and nights become equal all over the world, this is called autumnal equinox. |
| What is vernal equinox ? On 21 March, all places on the earth have equal days and nights, this is called vernal equinox |
| In which direction the earth moves ? From west to east. |
| What is the circle of illumination ? The circle which divides the earth into a light half and a dark half is called the circle of illumination. |
| At what speed the earth revolves around the sun ? 29.8 kilometer/second or about 1,00,000 kilometer/hour. |
| How much time the earth takes to complete one revolution ? 365 days and 6 hours, this period of time is called one year. |
| At which place the duration of day and night is equal throughout the year ? At any place on the equator |
| Why the days and nights are unequal on the earth ? Because the earth's axis is tilted. |
| What is the average distance from the Earth to the Moon? 238,857 miles (384,403.1 km) |
| What is the average distance from the Earth to the Sun? 93,020,000 miles (149,669,180 km) |
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