Rahu Kaal & Method to Calculate Rahu Kalam (Rahu Kaal)

In Indian Astrology, each day of the week has been assigned
its respective ruling planet viz. Monday is ruled by Moon,
Tuesday by Mars etc. However, Rahu and Ketu have not been
given any specific day as they are treated as nodes. However,
Rahu and Ketu are given one and half hours time in a day
resulting three hours for Rahu and Ketu in which they can cast
their malefic influence since Rahu is a natural malefic.

Rahu Kalam (Rahu Kaal) is an inauspicious period of time for
a particular day. In other words, Rahu Kalam is the time
during which Rahu seizes the opportunity for influence. During
this time one should avoid any auspicious work like starting
new business or project, buying expensive items,
investments, business transactions, journeys, meetings,
interviews etc. It is believed that any thing lost during Rahu
Kalam is never found.
Rahu Kaal is one-eighth part of the difference between the
Sunset and Sunrise time of a particular place for a specific day
of the week. The reason for its 8th part is that in some Indian
astrology systems, Rahu is considered to be the 8th planet.

To calculate Rahu kalam or Rahu kaal, first find the local Sun-
rise time and sun-set time of the place. This can be found
from a local panchang or your local newspaper. Next divide
the difference between the two time periods into 8 equal
parts. There is no Rahu Kalam during the first period of any
weekday. In other words, it is never just after sunrise. From
Monday to Sunday the period of Rahu Kaal or Rahu kalam for
each week day is then calculated as described below:

On Monday Rahukalam falls on the 2nd period
    Saturday                              3rd period
    Friday                                  4th period
    Wednesday                           5th period
    Thursday                              6th period
    Tuesday                               7th period
    Sunday                                 8th period

Study the examples in the Table given below
   Rahukalam Calculation
Week day
Example 1
Sunrise 6:00 a.m.
Sunset 6:00 p.m.
1/8 of Day = 90 minutes
Example 2
Sunrise 7:00 a.m.
Sunset 5:40 p.m.
1/8 of Day = 80 minutes
4:30 p.m. to 6:00 p.m.
4:20 p.m. to 5:40 p.m.
7:30 a.m. to 9:00 a.m.
8:20 a.m. to 9:40 p.m.
3:00 p.m. to 4:30 p.m.
3.00 p.m. to 4:20 p.m.
12 noon to 1:30 p.m.
12:20 p.m. to 1:40 p.m.
1:30 p.m. to 3:00 p.m.
1:40 p.m. to 3.00 p.m.
10:30 a.m. to 12 noon
11:00 a.m. to 12:20 p.m.
9:00 a.m. to 10:30 a.m.
9:40 a.m. to 11:00 a.m.
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