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Degree rising on the Ascendant can be calculated by referring to the tables of ascendants for various latitude published by

64 True Astrology - "Basic and Traditional

event against the column of the latitude of the place. If the table for the exact latitude is not available, the nearest latitude tables can be to find the exact degree by interpolation of the tables.

Second Method:

We can also calculate the position of the Ascendant in another way. The degree rising on the Ascendant will be equal to how much the Sun has moved in the sky after sunrise at the place of happening of an event, plus how much the Sun has moved in the Zodiac on that particular day in terms of time i.e. if we take that the Sun crosses the whole Zodiac one Sidereal day of the earth. Let X is time interval between sunrise (it is reckoned from the time when Sun's center is on horizon) and the time of happening of the event at a place on a particular day. This is called Ishtkaal. From the Ephemeris, we may note the position of the Sun at the time of sunrise on that date. Let it by in degrees, minutes and seconds. We then need to find out the speed at which Sun is moving on that date. it be S in degrees, minutes, seconds. The speed may be positive or negative i.e. increasing or decreasing respectively. Thus,

S (speed per day) =

Here is the speed on the midnight of a date say March.

And S2 is the speed of the Sun say on 28th March. N is the number of days i.e. here equal to 7.

Sun's position at this time of event will be calculated as follows: Sun's longitude Z= ± (S/24) X. This will indicate how Sun has moved in the Zodiac.

Now from the Ascendant table for the particular latitude we may

how time a / degree takes rise that place. Let

say and the next degree i.e. rise at T2. Then (T1-T2) will indicate the time taken by the Sun to move 1 degree in the sky.

Therefore, in X hours, Sun will cover degrees of the

zodiac.

Ascendant degree will be

Example:

us how we can calculate the Ascendant for the given birth date.

Birth 10.12.1993

Birth 03.50 AM

Place of Birth Bombay (Longitude 72.50 Latitude

Method

Calculate LMT

LMT = calculation 4 minutes

for each degree of longitude.

= (03.50-5.30) + 4hrs 5 20s

=

Calculation of Sidereal time for the given time and place of birth. For this we need Table of Ascendant (say Lahiri's Table of Ascendants).

Sidereal 10th December 17hr 14m 07s

Longitudinal correction for Bombay 06s

(page 101)

Correction year 1993 lm 52s

66 True Astrology - "Basic and Traditional Concepts"

Sidereal for Bombay 16m 05s

Let us now calculate the Sidereal time at Birth. As the birth is before noon, deduct

From 12h Os

LMT 3h 11m 20s

8h 48m 40s mean time correction the rate of 9.86 seconds per hour of the interval calculated above. This will come equal to lm 27s. So the exact time interval will be hr 50m 07 sec.

To get the Sidereal time at Birth, we need to deduct (For births before noon) this interval from the Sidereal time at Noon.

17h 16m 05s 8h 50m 07s

Therefore Sidereal at = 8h 25m 58s

Step Look for the page in the book of Table of Ascendants, which indicates the Ascendants as per Latitude nearest to the place of Birth. On page 29, Table for Latitude

degree N is given. The Latitude of Bombay is deg.

min. N. In this page look for the Ascendant for the

Sidereal time calculation above. may have to apply

method to calculate the exact degree. In

this case it will come to 14'. Now to get the

correct Nirayana Ascendant for 10.12.1993 we need

to apply Ayanamsha correction for year which

is - 46' from the table of Ascendant.

Calculation of Ascendant by 2nd Method: (Birth Data same as

above)

Birth =03.50 AM

Sunrise on = 05.30 (Say to calculations)

Therefore Ishtkaal = 22h 20m

Longitude of Sun at sunrise on = 7s 23 deg. 8 min.

Since speed on that date is 1 deg. 1 min. Therefore in x hrs (22 20 min) Sun will cover 0 deg. 57 min.

Therefore, Longitude of at 03.50 on 10.12.1993 be

min.

At the time of Sunrise on Scorpio 23 deg. 8 min. was

rising. Now have to calculate the time taken by each degree at place of birth to rise. Knowing it from the Tables we can

calculate using Ishtkaal the number of degrees that have be

risen before the birth time.

Time Correction:

During World the clock time put ahead of the standard

time by one hour in many countries. India also followed this time adjustment from 1.9.1942 to 15.10.1945. While casting the horoscope, it must be ascertained whether the time given by the individual is the standard time or the clock time if the birth has taken place during above dates.

Summer Time Correction:

Many countries put their clocks ahead of the standard time during summer. This point should be noted while casting the horoscope.

68 True Astrology - "Basic and Traditional Concepts"