Which of the following is not a unit of time?
Micro second
Leap year
Lunar month
Parallactic second
As we learnt in
Units of Time -
1 year 365.25 days 3.156 x 107 Sec
Lunar Month 1 Lunar Month = 27.3 days (it is the time taken by the moon to complete1 revolution around the earth in its orbit)
1 Average Solar Day 1/365.25 the part of solar year
-
Parallactic second
Option 1)
Micro second
Option is incorrect
Option 2)
Leap year
Option is incorrect
Option 3)
Lunar month
Option is incorrect
Option 4)
Parallactic second
Option is correct