Organization:Colaba Observatory

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Coordinates: 18°38′44″N 72°52′11″E / 18.645513°N 72.869611°E / 18.645513; 72.869611 Colaba Observatory was an astronomical, timekeeping, geomagnetic and meteorological observatory located on the Island of Colaba, Mumbai (Bombay), India.[1][2]


The Colaba Observatory is located in Bombay and was built in 1826 by the East India Company for astronomical observations and time-keeping, with the purpose to provide support to British and other shipping which used the port of Bombay.[3] The 165-year-old building served as office space for the Indian Institute of Geomagnetism. The recording of geomagnetism and meteorological observations was started at the observatory in 1841 by Arthur Bedford Orlebar, who was then Professor of Astronomy at Bombay’s Elphinstone College. Magnetic measurements between the years of 1841 and 1845 were intermittent; following 1845 they became bi-hourly, then hourly.

Sophisticated equipment invented by Francis Ronalds, the Honorary Director of the Kew Observatory, was supplied to Colaba in ensuing years. In 1846 the East India Company ordered his full atmospheric electricity collecting and measuring apparatus for the observatory.[4] Subsequent superintendents Charles Montriou and Edward Francis Fergusson maintained contact with Ronalds and visited him at Kew for hands-on instruction. It was arranged in 1867 for Kew's photo-recording machines to be supplied so that continuous observation of atmospheric pressure, temperature and geomagnetic intensity could be performed automatically.[5] Charles Chambers (later to become a Fellow of the Royal Society) held the Directorship when the new machines were established. Colaba Observatory became more well known through his examination of geomagnetic measurements at Colaba, and his interpretation of the physics behind the phenomena. After his untimely death in Feb. 1896, the mantle of Directorship fell on the shoulders of Dr. Nanabhoy Ardeshir Framji Moos, the first India n to hold this position.

Finally, the (magnetic) records of Colaba and Alibag were found to form a beautiful series, beginning in 1871, and making up perhaps, the most complete collection of records in the world. Their quality and especially their regularity were particularly impressive, even in comparison with the Kew and Melbourne records.

The Golden Jubilee of the foundation of the Magnetic Observatory at Alibag (Mumbai), is a historic one in the field of Geomagnetism, and marks the long established application of India in an unparalleled series of magnetic recording of the phenomena, and publication of interpretative discussions of the accumulated data, as prepared under the direction of India’s foremost investigator (N.A.F. Moos) in the two large volumes.

Despite over 1500 selected references in the field of geomagnetic research, Volume 3 of the Physics-of-the-Earth Series of the United States National Research Council, there is none which exhibits so wide and varied and intensive coverage of all the geomagnetic problems in the early 20th century.

During the IGY-IGC years of 1957–1959, Prof. K. R. Ramanathan (a past Director of Colaba-Alibag), strongly advocated the setting up of magnetic observatories to examine the equatorial electrojet. The Trivandrum and Annamalainagar observatories were set up in November 1957, and were tended first under the Directorship of Mr. S. L. Malurkar, and then under Prof. P. R. Pisharoty. Eighteen years elapsed before there was a need for further observatories along 75°E longitude meridian. The USSR sponsored "Project Geomagnetic Meridian" to serve their needs. Ujjain and Jaipur were consequently set up in July 1975, as wall as Shillong at 92°E longitude. In May 1977, Gulmarg, located very near the focus of the Sq. current system was started. In May 1991, the ninth observatory was started at Nagpur and then the observatories Vishakhapatnam, Pondicherry and Tirunelveli followed. Apart from these, a temporary station was run in the Andaman Islands in 1974 as support for the ONGC (Oil and Natural Gas Commission of India) in petroleum prospecting. Since 1979, an array of Gough-Reitzel magnetometers has operated at various sites in India for studies of the Earth's internal structure by examining electromagnetic induction within the earth. The Indian Institute of Geomagnetism currently operates Ten magnetic observatories.

See also


  1. Indian Institute of Geomagnetism
  2. History of the Institute
  3. Charles Chambers (of Colaba observ.) (1878). The meteorology of the Bombay presidency. [With] Diagrams and maps. Dangerfield. 
  4. Ronalds, B.F. (2016). Sir Francis Ronalds: Father of the Electric Telegraph. London: Imperial College Press. ISBN 978-1-78326-917-4. 
  5. Bryden, D.J. (2006). "Quality Control in the Making of Scientific Instruments". Bulletin of the Scientific Instrument Society. 

Further reading

  • Lakhina, G. S.; Alex, S.; Tsurutani, B. T.; Gonzalez, W. D. (2004), "Research on Historical Records of Geomagnetic Storms", Proceedings of the International Astronomical Union 2004: 3–15, doi:10.1017/S1743921305000074 

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