Exterior scene showing a rear view of the 7 foot equatorial sextant with a telescopic sight designed for the old Royal Observatory by John Flamsteed (1646-1719) the first Astronomer Royal. The instrument is on an observing platform upon which can be seen stepladders and a lantern. Plate 4 (right half detail) from Ichnographia speculae Regiae Grenovici exquisite facta (London, 1676) a series of engravings commissioned by Sir Jonas Moore, the leading force in the construction and equipping of the original Royal Greenwich Observatory. The plate bears the inscription: "Fanis Sextantis Posterior 7 ped: Rad:." Sir Jonas Moore (1617-1679) mathematician and patron of astronomy was elected a Fellow of the Royal Society in 1674.
Original: etching. 1676
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Equatorial sextant at the Royal Observatory, Greenwich appears in: