You are holding the best source to astronomical calculations ever published! What was the day and tithi at the time of your birth? How were the planets positioned at that time? What is Panchanga? At what time will the sun rise tomorrow? What is the moon rise-time on the next Sankashti Chaturthi? When is the next lunar eclipse? Why the lunar eclipses do not occur on full moon days? When will be the next solar eclipse? Will it be a total, annular or partial one? Will it be visible from your place? If not, where will it be visible? What will be the timing of its visibility? How many lunar and solar eclipses would occur in the 21st century? What is Ayanamsha? How many days of Kaliyug are remaining? You will be able to answer all of these questions and many more with the help of A Guide to Astronomical Calculations.