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The item is a 6 inch transit circle. The transit circle is an instrument used to determine the declination of stellar onjects. It consists of a circular scale kept perpendicular to the rotating axis of a telescope tube.

This item was a stellar object requires two coordinates to locate it on the sky, as the sky is a two-dimensional plane. One of these coordinates known as declination. This is similar to the two co-ordinates viz. latitude and longitude, defining a point on the surface of the earth. The transit circle is an instrument used to determine the declination of stellar onjects. It consists of a circular scale kept perpendicular to the rotating axis of a telescope tube.

The fond contains Results of observations of the fixed stars made with the Meridian Circle at the Government Observatory , Madras

The item comprises observations notes of the separate results of Madras Meridian Circle Observation by N. R.Pogson in 1864 and 1875.

The book contains the results of observations of the fixed stars made with the meridian circle at the government observatory Madras in the years 1868, 1869 and 1870 under the direction of Norman Robert Pogson, government astronomer at Madras.

Results of observations of the fixed stars made with the Meridian circle at the Government Observatory, Madras in the years 1880,1881 and 1882.

Results of observations of the fixed stars made with the Meridian circle at the Government Observatory, Madras in the years 1877, 1878 and 1879.

Results of observations of the fixed stars made with the meridian circle at the Government Observatory, Madras in the years 1865, 1866 and 1867.

Results of observations of the fixed stars made with the meridian circle at the Government observatory Madras in the years 1874, 1875 and 1876.

Results of observations of the fixed stars made with the Meridian Circle at the Government Observatory, Madras, in the years 1871, 1872 and 1873.