Question

Finish these sentences.

a
Our day is 24 hours long because that is the time it takes the Earth to:

b
A year has 365 days because that is the number of whole days it takes
the Earth to:

Q7) Why do we need to have a leap year once every four years?

Answer 1

1. complete a 360 degree rotation.

2. circle around the Sun.

3. Every four years, we add an extra day, February 29, to our calendars. These extra days – called leap days – help synchronize our human-created calendars with Earth's orbit around the sun and the actual passing of the seasons. ... Blame Earth's orbit around the sun, which takes approximately 365.25 days.

Step-by-step explanation:

Answer 2

It takes approximately 365.25 days for Earth to orbit the Sun — a solar year. We usually round the days in a calendar year to 365. To make up for the missing partial day, we add one day to our calendar approximately every four years. That is a leap year.