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The Last Meridian Circles -- an Epilogue
Erik Høg
The aim is to document in some detail the last 35 years of meridian circles, a type of instrument with a fundamental role in astronomy for a very long time, and to do so while witn…
Astrometric Accuracy of Positions
Erik Høg
The great development of astrometric accuracy since the observations by the Greek astronomer Hipparchus about 150 BC has often been displayed in diagrams showing the accuracy versu…
A review of 70 years with astrometry
Erik Høg
In 1953 I heard of an experiment in 1925 by Bengt Strömgren where he observed transit times with the meridian circle at the Copenhagen University Observatory measuring the current…
Archives on astronomy from the 1950s
Erik Høg
Information on archives from the 1950s of 15 astronomical observatories is provided beginning with a list of correspondence and other information related to astronomy of the Copenh…