This annual astronomical ephemeris has stepped into 73rd year of its publication with the present issue for 2011. The Ephemeris was founded by late N. C. Lahiri in 1939, the first Indian member of the Ephemerides-Commission of the International Astronomical Union, Paris, and the first Officer-in-charge of the then Nautical Almanac Unit of the Govt. of India (now known as Positional Astronomy Centre) at Kolkata. The local almanacs published from different parts of India are still giving erroneous astronomical parameters for preparation of the almanacs. We are earnestly exerting our efforts for rectification of 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 nirayana 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 1948 issue. The Calendar Reform Committee appointed by the Govt. of India In 1952 recommended adoption of this value of ayanamscs and later the Govt. of India also adopted this system of ayanamsa in 1953. In view of this, it is called as Lahiri-Ayanamsa. This value of ayanamsa is now being used in almost all the reformed panchangs and ephemeris in India as well as in the Indian Astronomical Ephemeris and the Rashtriya Panchangs of the Govt. of India. It is worth mentioning that the date of coincidence of the Sayana and Nirayana zodiacs on the Vernal Equinox day of 285 AD. based on the position of the star Chitra (a 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 Astronomisches Rechen institute of Heidelberg, Germany.
We express our thanks to the Director, Positional Astronomy Centre, Kolkata of India Meteorological Department (Govt. of India) for 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 for 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.
| Preface | 3 | |
| Explanatory Notes | 4-5 | |
| Details of Ephemeris | 6-7 | |
| Time Changes in India, Vaidhrit and Vyatipata Yoga | 8 | |
| Beginning Dates of Lunar months, Phases of the Moon, Longitude of Sun at New Mon and Full Moon, Dates of Equinoxes and Solstices | 9 | |
| Beginning dates of Islamic Calendar, Vedic solar months & Indian seasons, Moon and Sun at Perigee and Apogee | 10 | |
| Solar Calendars of India & Beginning of Eras | 11 | |
| Perpetual Calendar | 12 | |
| Mean Distance of Sun, Moon and Planets & Duration of Daylight | 13 | |
| Nirayana Longitudes of Mean Sun, Ayanamsa and Miscellaneous Astronomical data | 14 | |
| Daily Ephemeris (Jan. to Dec.) | 16-39 | |
| Daily motion of Sun and Moon | 40 | |
| Daily motion of Mercury and Venus | 41 | |
| Daily motion of Mars, Jupiter & Saturn | 42 | |
| Entrance of Sun into nakshatras and Moon into nirayana signs | 43 | |
| Transit of Planets into Rasis, Navamsa Chart | 44 | |
| Transits of Planets into nakshtras and Beginning of Nakshatra Division | 45 | |
| Phenomena-conjunction and opposition of planets, Heliacal setting or combustion of planets and Retrogression of planets | 46 | |
| Interpolation Table | 47 | |
| Diagram of Movement of Planets | 48 | |
| Movement and Visibility of Planets | 49 | |
| Advance Ephemeris, 2012 | 50-51 | |
| Rising and Setting or Planets | 52-55 | |
| Heliocentric Longitudes of Planets | 56 | |
| Right Ascension of Planets | 57 | |
| Yearly Journey of the Earth (Map) | 58 | |
| Tithi, Nakshatra & Yoga | 59-62 | |
| Karanas | 63-66 | |
| Eclipses | 67-68 | |
| Dates of Eclipses during 2011 | 68 | |
| Mean Places of Stars | 69 | |
| Star Charts | 70-71 | |
| Aspects & Phenomena | 72-89 | |
| Sunrise and Sunset of certain places | 90-99 | |
| Local Mean Time of Sunrise and sunset | 100-101 | |
| Moonrise and Moonset of certain places | 102-109 | |
| Method for calculation of Sunrise, Sunset & Moonrise, Moonset | 110 | |
| Solar Return or Varsapraves | 111 | |
| Astottari Dasa – Krittikadi and Ardradi | 112-113 | |
| Astottari Dasa & Antardasa | 114 | |
| Vimsottari Dasa & Antardasa | 115 | |
| Balance of Vimsottari Dasa | 116-117 | |
| Vimsottari Dasa – Sub-sub period | 118-124 | |
| Method for casting a birth chart | 125 | |
| Accessional Differences | 126-127 | |
| Local Mean time of beginning of Lagnas | 128 | |
| Correction Table for beginning of Lagnas | 129 | |
| Tables of Ascendants | 130-131 | |
| Table of Tenth House | 132-133 | |
| Ascendant for Chennai, Mumbai, Kolkata, Varanasi and Delhi | 134-143 | |
| Ayanamsa Correction | 144 | |
| Table of Reduction of Local Mean time of a place into I.S.T | 145 | |
| Latitude, Longitude an principal cities in India | 146-155 | |
| Standard tome of India | 155 | |
| Local Time of some cities of neighboring countries | 156 | |
| Local Time of some foreign cities | 157-159 | |
| Standard Time Zone of the World | 160 | |
| Standard Time Zone (Map) | 161 | |
| Ephemeris Time | 162 | |
| Method for finding out Ascendant of a Foreign city | 163 | |
| Standard Time Zone and Summer Time | 164-165 | |
| Table of Proportional Logarithm | 166-167 | |
| Astronomical Observatories in India | 168-169 | |
| Planetariums in India | 170 | |
| Glossary | 171-180 |
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This annual astronomical ephemeris has stepped into 73rd year of its publication with the present issue for 2011. The Ephemeris was founded by late N. C. Lahiri in 1939, the first Indian member of the Ephemerides-Commission of the International Astronomical Union, Paris, and the first Officer-in-charge of the then Nautical Almanac Unit of the Govt. of India (now known as Positional Astronomy Centre) at Kolkata. The local almanacs published from different parts of India are still giving erroneous astronomical parameters for preparation of the almanacs. We are earnestly exerting our efforts for rectification of 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 nirayana 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 1948 issue. The Calendar Reform Committee appointed by the Govt. of India In 1952 recommended adoption of this value of ayanamscs and later the Govt. of India also adopted this system of ayanamsa in 1953. In view of this, it is called as Lahiri-Ayanamsa. This value of ayanamsa is now being used in almost all the reformed panchangs and ephemeris in India as well as in the Indian Astronomical Ephemeris and the Rashtriya Panchangs of the Govt. of India. It is worth mentioning that the date of coincidence of the Sayana and Nirayana zodiacs on the Vernal Equinox day of 285 AD. based on the position of the star Chitra (a 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 Astronomisches Rechen institute of Heidelberg, Germany.
We express our thanks to the Director, Positional Astronomy Centre, Kolkata of India Meteorological Department (Govt. of India) for 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 for 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.
| Preface | 3 | |
| Explanatory Notes | 4-5 | |
| Details of Ephemeris | 6-7 | |
| Time Changes in India, Vaidhrit and Vyatipata Yoga | 8 | |
| Beginning Dates of Lunar months, Phases of the Moon, Longitude of Sun at New Mon and Full Moon, Dates of Equinoxes and Solstices | 9 | |
| Beginning dates of Islamic Calendar, Vedic solar months & Indian seasons, Moon and Sun at Perigee and Apogee | 10 | |
| Solar Calendars of India & Beginning of Eras | 11 | |
| Perpetual Calendar | 12 | |
| Mean Distance of Sun, Moon and Planets & Duration of Daylight | 13 | |
| Nirayana Longitudes of Mean Sun, Ayanamsa and Miscellaneous Astronomical data | 14 | |
| Daily Ephemeris (Jan. to Dec.) | 16-39 | |
| Daily motion of Sun and Moon | 40 | |
| Daily motion of Mercury and Venus | 41 | |
| Daily motion of Mars, Jupiter & Saturn | 42 | |
| Entrance of Sun into nakshatras and Moon into nirayana signs | 43 | |
| Transit of Planets into Rasis, Navamsa Chart | 44 | |
| Transits of Planets into nakshtras and Beginning of Nakshatra Division | 45 | |
| Phenomena-conjunction and opposition of planets, Heliacal setting or combustion of planets and Retrogression of planets | 46 | |
| Interpolation Table | 47 | |
| Diagram of Movement of Planets | 48 | |
| Movement and Visibility of Planets | 49 | |
| Advance Ephemeris, 2012 | 50-51 | |
| Rising and Setting or Planets | 52-55 | |
| Heliocentric Longitudes of Planets | 56 | |
| Right Ascension of Planets | 57 | |
| Yearly Journey of the Earth (Map) | 58 | |
| Tithi, Nakshatra & Yoga | 59-62 | |
| Karanas | 63-66 | |
| Eclipses | 67-68 | |
| Dates of Eclipses during 2011 | 68 | |
| Mean Places of Stars | 69 | |
| Star Charts | 70-71 | |
| Aspects & Phenomena | 72-89 | |
| Sunrise and Sunset of certain places | 90-99 | |
| Local Mean Time of Sunrise and sunset | 100-101 | |
| Moonrise and Moonset of certain places | 102-109 | |
| Method for calculation of Sunrise, Sunset & Moonrise, Moonset | 110 | |
| Solar Return or Varsapraves | 111 | |
| Astottari Dasa – Krittikadi and Ardradi | 112-113 | |
| Astottari Dasa & Antardasa | 114 | |
| Vimsottari Dasa & Antardasa | 115 | |
| Balance of Vimsottari Dasa | 116-117 | |
| Vimsottari Dasa – Sub-sub period | 118-124 | |
| Method for casting a birth chart | 125 | |
| Accessional Differences | 126-127 | |
| Local Mean time of beginning of Lagnas | 128 | |
| Correction Table for beginning of Lagnas | 129 | |
| Tables of Ascendants | 130-131 | |
| Table of Tenth House | 132-133 | |
| Ascendant for Chennai, Mumbai, Kolkata, Varanasi and Delhi | 134-143 | |
| Ayanamsa Correction | 144 | |
| Table of Reduction of Local Mean time of a place into I.S.T | 145 | |
| Latitude, Longitude an principal cities in India | 146-155 | |
| Standard tome of India | 155 | |
| Local Time of some cities of neighboring countries | 156 | |
| Local Time of some foreign cities | 157-159 | |
| Standard Time Zone of the World | 160 | |
| Standard Time Zone (Map) | 161 | |
| Ephemeris Time | 162 | |
| Method for finding out Ascendant of a Foreign city | 163 | |
| Standard Time Zone and Summer Time | 164-165 | |
| Table of Proportional Logarithm | 166-167 | |
| Astronomical Observatories in India | 168-169 | |
| Planetariums in India | 170 | |
| Glossary | 171-180 |
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