Heavily constructed in brass and bearing date ‘1135’ AH
(1722/23 CE) on the shaped throne, six double-sided
planispheric plates and fret-worked rete secured with stylised
‘horse’, the reverse etched with shadow square, calendar
and hour scales etc., unmarked alidade with sighting vanes,
the whole suspended from a hinged joint -- 45⁄8in. (11.8cm.)
diameter; mater 3⁄8in. (1cm.) thick This astrolabe appears to be a near-faithful copy of the ‘Isa ibn
Allahdad’ astrolabe of Lahore, Pakistan contained in the Adler
Planetarium & Astronomy Museum, Chicago, Inv. No. A-79
(IC 1096). This is a little larger with a 7.in. (18.5cm.) diameter, 3/8in.
(1cm.) thick mater and is dated for 1013 (1605/05).