A telescope mounted so as to move only on a north-south line, for observing the transit of celestial objects across the meridian.
- Thus, with allowance for possible systematic errors in both the meridian circle and Mercury transit timing observations, a negative secular trend of solar radius is still supported.
- I found my first meridian circle outside a house in Crownfield Road.
- Ertel also designed meridian circles for the observatories of Christiania, Glasgow and Warsaw.
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