This project computes a Pañcāṅgam for a given location and given year. It uses planetary positions from the Swiss ephemeris to (somewhat accurately) calculate important aspects of a day, particularly the five āṅgams, viz. tithi (moon phase), nakshatram (asterism), yogam, karaṇam and vāram, and also the occurrence of various Hindu festivals, which are usually decided by elaborate rules dependent on the (combinations of the) āṅgams.

1. Generate an A3 PDF of a monthly calendar using Python / TeX (using gen_monthly_cal.sh or write_monthly_panchangam_tex.py)
2. Generate an A5 PDF of a daily calendar using Python / TeX (using gen_daily_cal.sh or write_daily_panchangam_tex.py)
3. Generate an ICS calendar file for using with calendaring applications (using gen_ics.sh or write_panchangam_ics.py)

The PDFs and ICS are best generated using a Devanagari (and Tamil) scripts, though IAST works as well (mostly).

Just clone this repository:

$ git clone https://github.com/karthikraman/panchangam.git panchangam

Alternatively, download a ZIP file here.

Make sure you have the necessary Python/TeX packages installed, as mentioned below.

• Both Python 3 and LaTeX are necessary to generate the panchangam PDFs; to generate the ICS alone, only Python 3 suffices
• Python: pyswisseph, SciPy, icalendar and pytz
• XeLaTeX / fontspec and a few other 'regular' packages
• Fonts: Sanskrit 2003, Candara, Vijaya (for Tamil)

There are helpful scripts in the bin folder, while the Python codes are in the panchangam folder. Generated PDFs will go to the pdf folder and .ics files will go to the ics folder, from which they can be imported into any calendaring application.

cd panchangam/bin
./gen_daily_cal.sh Chennai 13:05:24 80:16:12 'Asia/Calcutta' 2017 devanagari lagna
./gen_monthly_cal.sh Chennai 13:05:24 80:16:12 'Asia/Calcutta' 2017 devanagari
./gen_ics.sh Chennai 13:05:24 80:16:12 'Asia/Calcutta' 2017 devanagari

The above codes generate two PDF files (daily-cal-2017-Chennai-deva.pdf, cal-2017-Chennai-deva.pdf) and an ICS file (Chennai-2017-devanagari.ics) in the pdf and ics folders respectively.

Currently, the documentation is sparse, but I hope to populate more in the docs folder. There are also some useful references in the docs/ref folder.

• drik-panchanga: well-written Python-based panchangam, with a nice simple GUI
• drikpanchang.com: online calendar, with a lot of details, festivals etc.

Sincere thanks to the creators of pyswisseph, without which I could not have attempted this. Many thanks are due to Ajit Krishnan for so clearly explaining the panchangam process, and example festivals, which was sort of the inspiration for integrating a number of festivals. Many thanks to Saketha Nath for getting details of hundreds of festivals from obscure sources, and to the Vaidikasri magazine, which is another veritable treasure house of these festivals.

It is very important to note that this is an approximate panchangam, automatically generated, without the careful oversight of learned scholars who have the depth of knowledge to resolve the exact dates for occurrences of different festivals. Also, the ayanamsha used here conforms to the Drik panchanga. The best use of this panchangam is as an approximate guide (95% of the events are also probably spot on) --- when in doubt, consult only your own panchangam!

I have not extensively tested the code, especially for Southern Hemisphere locations etc. I have primarily restricted my example testing to Chennai, Mumbai, London and Palo Alto. Please let me know of any bugs or errors that you encounter by raising an issue and I'll do my best to fix them. I wish I had the time to rewrite the whole thing efficiently; there are far too many vestiges of the old code built on my then novice Python knowledge!