Sundials

Movable-gnomon Sundials - Analemmatic Sundials
... Analemmatic sundials are a type of horizontal sundial that has a vertical gnomon and hour markers positioned in an elliptical pattern ... Analemmatic sundials are sometimes designed with a human as the gnomon ... Human gnomon analemmatic sundials are not practical at lower latitudes where a human shadow is quite short during the summer months ...

Erhard Etzlaub - The Instrument Maker
... "Kompast" was the term used for pocket-size sundials produced in Nuremberg since Regiomontanus' days, which were fitted with a compass, too, and were also used by seafarers ... work in Brevis Germaniae Descriptio, 1512, that his sundials were even demanded in Rome ... Instructions on the use of his sundials were given by Etzlaub in Codex ad Compastum Norembergensem which was kept by Staatsbibliothek, Munich, Germany ...

Turret Clock - History - Sundials
... The earliest public clocks were sundials. ...

History Of Timekeeping Devices - Modern Devices - Modern Devices of Ancient Origin
... Sundials were further developed by Muslim astronomers ... is parallel to the Earth's axis will produce sundials whose hour lines indicate equal hours on any day of the year" ... His sundial is the oldest polar-axis sundial still in existence ...

History Of Timekeeping Devices In Egypt - Sundials and Shadow Clocks
... attribution of the invention of the sundial to the Babylonians in 430 BC, the earliest known sundials were simple gnomons of Egyptian origin invented around ... Shadow clocks were modified sundials that allowed for greater precision in determining the time of day, and were first used around 1500 BC ...