The names of the Week Days are derived from where ?
Why Monday is after Sunday?
Why Tuesday is after Monday ?
The answer is given by Astrology as Planetary Hours or Kala Horas. If you
have any other explantion - from Astronomy or any other scienc - pls let us
Question - How did Monday come after Sunday in the Calender ?
Answer - To answer this question, we have to go to the concept of Planetary
Hours or Kala Horas
The Planetary Hours are counted from Sunrise and the owner of the Planetary
is the Lord of the Weekday. Today is Sunday and one hour from Sunrise is
presided by the lord of Sunday, the Sun.
The sequential order of Planetary Hours is as follows.
( Arka Shukra Budhas Chandra Manda Jeeva Dharasutha, Kramena Kala
So if the first Planetary Hour on Sunday is presided by the Sun, the next
hour is presided by Venus, next by Mercury and so on. This goes on for 21
hours and the 22nd Planetary Hour is presided by Sun, the 23rd by Venus, the
24th by Mercury and the 25th, the first Planetary Hour next day, is presided
by the Moon and hence his day, Monday, became the next week day in the
We have these basic equations
Sunset - Sunrise = Duration of Day, Dinamana
Sunrise (next day ) - Sunset = Duration of Night, Ratrimana
The diurnal duration is divided by 12 to get Planetary Hours. The diurnal
duration will vary, as Day = Night = 12 Hours occurs only on Equinox days.
Similarly the nocturnal duration is divided by 12.
Dina Dwadasamso Matha Kala Hora
Pathi Thasya Poorvasya Varadhinadha
Thadha Shashta Shashta Kramena Tharesam
Nishyayam thu vareshwarad Panchamadya.
Here is a table depicting the Weekday Numbers and Planetary Hour Numbers
WeekNo Planet PHNo
1 SUN 1
2 MOON 4
3 MARS 7
4 MERCURY 3
5 JUPITER 6
6 VENUS 2
7 SATURN 5