Bismillahir Rahman nir Raheem
I have discussed how to calculate the sankaraant or Sun’s transit time in chapter no.20. In this chapter I am going to explain how to calculate the lagan. First of all one has to see in which zodiac constellation is the Sun. After the Sun’s position is determined, then till the period the Sun reaches the next zodiac constellation, the time of Sunrise will be known as the lagan of that zodiac constellation. For example, if the Sun is in Aries, then the time of Sunrise during that phase will be considered to be the lagan of Aries. A day is divided into 60 Ghadis. So after 5 Ghadis would be the Taurus lagan. Then after 5 Ghadis would be the Gemini lagan. Similarly after every 5 Ghadis the lagan will keep on changing and the next day it would be the lagan of the same zodiac sign in which the Sun will be positioned at that time of the year. When the length of the day and nights are equal, as during equinoxes, then the lagan are of the same duration. However, if the days become shorter then nights then the lagan of day will be lesser then 5 Ghadis.
On the contrary when the days will be longer then nights then the lagan of the night will get shorter then 5 Ghadis.
Here is a table which will make the concept of lagan easy to understand.
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