Astronomical Observations made at the Royal Observatory, Edinburgh

Smyth, C. Piazzi

doi:10.1093/mnras/18.1.21

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“…Evans (1872) gives the results of these observations and also values for epoch 1872-0 derived from them. Smyth (1871), in the Introduction, quotes a value of D made at the Royal Observatory on Calton Hill in October 1871, 'with a borrowed needle'. In the Introduction to the next volume of astronomical observations, Smyth (1877) quotes a value made at the same place in October 1877.…”

Section: Declination Observations At Different Sitesmentioning

confidence: 99%

Observations of the Earth's magnetic field made in Edinburgh from 1670 to the present day

Barraclough

1994

Transactions of the Royal Society of Edinburgh: Earth Sciences

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Magnetic observations made at the same site give valuable information about the time changes (the secular variation) of the geomagnetic field. This paper gives details of all known measurements of the geomagnetic field in and around Edinburgh since the earliest observation of magnetic declination (the difference between true and magnetic north) by George Sinclair in 1670. Early observations of the strength of the field were only relative measurements. Approximate conversion factors are derived to enable these data to be expressed in modern absolute units (nanoteslas). Observed values of declination, inclination and the horizontal intensity of the geomagnetic field are plotted and compared with values computed from mathematical models of the field covering the interval 1690 to 1990, inclusive. The earlier observations were not corrected for the effects of the rapidly varying magnetic fields caused by electric currents in the upper atmosphere. The consequences of this are estimated.

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Section: Declination Observations At Different Sitesmentioning

confidence: 99%

Observations of the Earth's magnetic field made in Edinburgh from 1670 to the present day

Barraclough

1994

Transactions of the Royal Society of Edinburgh: Earth Sciences

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Astronomical Observations made at the Royal Observatory, Edinburgh

Cited by 1 publication

References 0 publications

Observations of the Earth's magnetic field made in Edinburgh from 1670 to the present day

Observations of the Earth's magnetic field made in Edinburgh from 1670 to the present day

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