This annual astronomical ephemeris has stepped into 77th year of its publication with the
present issue for 20 l 5. The Ephemeris was founded by late N. C. Lahiri in l939, the first Indian
member of the Ephemerides-Commission of the lntematlonal Astronomical Union, Paris, and
the lirst Oflicer-in-charge of the then Nautical Almanac Unit ofthe Govt. of lndia (now known
as Positional Astronomy Centre) at Kolkata. The local almanacs published from different parts
of lndia are still giving erroneous astronomical parameters for preparation of the almanacs. We
are eamestly exerting our efforts for rectification ol` such parameters shown in those almanacs.
This ephemeris is intended to provide most accurate and up-to-date astronomical data in advance
to its users.
The ephemeris is based on uirayana or sidereal system of calculation. The basis of the
nirayana zodiac is the adoption of 285 A. D. or 207 Saka as the zero ayanamsa year. This
value was adopted by Shri N. C. Lahiri in this Ephemeris from |948 issue. The Calendar
Reform Committee appointed by the Govt. of lndia in |952 recommended adoption of this
value of ayanamsa and later the Govt. of lndia also adopted this system of ayanamsa in l953.
ln view of this, it is called as Lahiri-Ayanamsa. This value of ayanamsa is now being used in
almost all the refonned panchangs and ephemeris in lndia as well as in the Indian Astronomical
Ephemeris and the Rashtriya Panchangs of the Govt. of lndia. lt is worth mentioning that
the date of coincidence of the Sayana and Nirayana zodiacs on the Vemal Equinox day of
285 A.D. based on the position of the Star Chitra (ot Virginis) as was determined by late N. C.
Lahiri during his life time is almost the same as derived from the data available from the
Aslronamisches Rechen Inslilute ofHeidelberg, Germarzy.
We express our thanks to the Director, Positional Astronomy Centre. Kolkata of lndia
Meteorological Department (Govt. of lndia) t`or kindly supplying some astronomical data for
use in the Ephemeris. Sincerest thanks are also to our esteemed readers and users of this
ephemeris for their kind co-operation and suggestions. Suggestions l`or further improvement
of this ephemeris would be highly appreciated. Utmost care is always taken to bring out this
publication free of any error.
We are making best efforts to add each year some additional data which are to facilitate
the users of this ephemeris for their computational work.