Varjukvadrant võib kasutada nimetusena mistahes mõõtevahendi, millega mõõdetakse päikese kõrgust varju projektsiooni abil, kohta. Varjukvadrandi leiutas inglise meresõitja John Davis, kes kirjeldas seda 1594. a oma raamatus „Seaman's Secrets“.
Backstaff is the name given to any instrument that measures the altitude of the sun by the projection of a shadow. It was invented by the English navigator John Davis, who described it in his book Seaman's Secrets in 1594.
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