The mean sun does move at a uniform speed but otherwise requires the same time as the real sun to complete one orbit of the earth, this time being

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UPSC ESE Electronics & Communication 2022 Official Paper
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  1. the tropical year
  2. the leap year
  3. the Julian calendar year
  4. the Gregorian calendar year

Answer (Detailed Solution Below)

Option 1 : the tropical year
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Detailed Solution

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Tropical year or solar year  :

The time that the Sun takes to make one complete rotation of a celestial body such as Earth.

Leap Year : 

When Earth requires 365.25 days to revolve around Sun , approximately say it a day extra .

Julian Calendar Year : 

It was given by the Roman which consists of 3 consecutive year of 365 days followed by leap year of 366 days.

Gregorian calendar year :

It was derived from Julian but differs that no century year is leap year.

Hence correct option is "1"

 

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