ALTITUDE Instrument, or Equal Altitude Instrument, is that used to observe a celestial object when it has the same altitude on the east and west sides of the meridian.
ALTITUDE Instrument
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sub_entry · 167 chars · lineage ↗ · page image at NLS ↗
ALTITUDE Instrument, or Equal Altitude Instrument, is that used to observe a celestial object when it has the same altitude on the east and west sides of the meridian.