Yamaganda is a particular time in a day considered not
suitable for starting a new work. This calculation is based on Hindu
Muhurtasashtra or electional astrology. A day (sunrise to sunset) is divided
into 8 equal portions called ardha yama, which are 1:30 hours. These periods
are either good or bad.
The time of Yamaganda depends on sunrise in a particular area.
The general Yamaganda period is as follows:
12:00 PM to 1:30 PM on Sunday
10:30 AM to 12:00 PM on Monday
9:00 AM to 10:30 AM on Tuesday
7:30 AM to 9:00 AM on Wednesday
6:00 AM to 7:30 AM on Thursday
3:00 PM to 4:30 PM on Friday
1:30 PM to 3:00 PM on Saturday
Compared to Rahukalam, Yamaganda Kalam does not carry the same intensity of evil and is not as widely followed as the former. Yamaganda Kalam is not considered a mahadosha or major affliction as per classical astrological works. But it is given too much importance in certain parts of India.
Please note that there is another time period in Hindu astrology and it is known as Yamakantaka and it is considered auspicious.