Nilakantha's Annual Horoscopy

...that this is certain. An example of this matter has already been shown previously. Having understood that equality between the two results from this method, the great teacher Shri Keshava Daivajña Keshava Daivajña (c. 15th century) was a famous astronomer and father of the even more famous Ganesha Daivajña. He wrote the Jataka Paddhati, a foundational text for horoscopy.—the crest-jewel of the circle of astrologers—prescribed no other correction even at the time of the Year Entrance Varshapravesha: the precise moment the Sun returns to its birth position, marking the start of the astrological year. What was stated by Ganesha Daivajña Ganesha Daivajña (b. 1507) authored the Grahalaghava. Here, the author is siding with the father (Keshava) against the son (Ganesha) on a technical point of correction. is incorrect. || 17 ||

Now, the true planets Spashta Grahas: the actual observed positions of planets as opposed to their theoretical mean positions at the time of the Year Entrance must be calculated. For the sake of ease, the author describes the adjustment original: "chalana" to be applied to the planets as listed in the almanac Panchanga: the traditional five-attribute Hindu calendar/ephemeris:

Multiply the daily motion of the planet (in minutes and seconds) by the number of days passed or remaining. Divide the result by sixty (60). The resulting degrees, minutes, and seconds should be subtracted from or added to the positions in the almanac. If the interval is "past," subtract it; if it is "remaining," add it. That will be the true planet for that specific moment. Note that for planets in retrograde motion Vakra: appearing to move backward in the sky and for Rahu and Ketu The North and South Lunar Nodes, which always move "backward" through the zodiac., the adjustment is known to be the opposite of the other planets.

Example: Within the day and time of the Year Entrance 2 | 12 | 18, the limit...

The True Sun and other Planets:

Now, the true planets at the time of the Year Entrance are to be determined. For the sake of ease, the adjustment to the planets in the almanac is explained: Multiply the daily motion by the past or future days, then divide by sixty (60). The resulting degrees and minutes are to be subtracted or added; then the planet becomes "true." || 18 ||

Now, the method for deriving the Moon from the lunar mansion Nakshatra: one of the 27 sectors of the lunar zodiac listed in the almanac is described: Multiply the "past duration" Bhayaata: the time already spent by the Moon in the current Nakshatra by sixty (60), and divide by the "total duration" Bhabhoga: the total time the Moon takes to cross that Nakshatra. This is then combined with sixty (60) times the number of preceding Nakshatras and multiplied by two. The position of the Moon is thus found. The daily motion is found by dividing 48,000 by the total duration of the Nakshatra. || 19 ||

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...when 6 | 13 | 56 is subtracted from the day and time of the entrance, the "adjustment digits" original: "chalana-anka" are 2 | 58 | 22. All planets have been adjusted using this. || 18 || At the time of the Year Entrance, one must calculate the elapsed ghatikas A unit of time equal to 24 minutes. of the current Nakshatra up to the desired time. These should be multiplied by sixty and divided by the total duration. The result, added to the count of Nakshatras starting from Ashwini The first of the 27 Nakshatras. and multiplied by sixty, gives the total ghatikas from the start of Ashwini to the desired time.