Practical Units - Practice Questions & MCQ

- 1 year $=365.25$ days $=3.156\ast {10}^7$ Sed
- Lunar Month- 29.53 days ( 29 days 12 hours and 44 minutes) (It is the time taken by the moon to complete 1 revolution around the earth in its orbit or A lunar month is a duration between successive new moons)
- Solar day-lt is the time taken by the earth to complete one rotation about its axis with respect to Sun.
- Sidereal day- It is the time taken by the earth to complete one rotation about its axis with respect to a distant star.
- 1 Solar year- 366.25 sidereal days $=365.25$ average solar day
- 1 Average Solar Day= $\left({\frac{1}{365.25}}^{th}\right)$ part of the solar year
- 1 solar second $={\left({\frac{1}{86400}}^{th}\right)}_{\text{part of the mean solar day }}$