Question

What do you understand by the following:

(a) Century, 

(b) Shake, 

(c) Lunar month, 

(d) Leap year, 

(e) Tropical year.

Answer 1

(a) It is the largest unit of time. 1 century = 100 years.

(b) It is the smallest unit of time, 1 shake = 10^-8 sec.

(c) It is the time taken by the moon to complete one revolution around the earth. 1 lunar month = 9.53 days.

(d) A year which is divisible by 4 and in which the month of February is of 29 days is called leap year.

(e) The year in which total solar eclipse takes place is called topical year.