Yearometer
The yearometer, or year meter, (COMIC: The Doctor Strikes Back [+]Loading...["The Doctor Strikes Back (comic story)"]) was an instrument in the Doctor's TARDIS that showed the TARDIS's position in time and space. It stopped calculating properly after the First Doctor left England in November 1963. (TV: "The Cave of Skulls" [+]Part of An Unearthly Child, Loading...{"namedep":"The Cave of Skulls (2)","1":"An Unearthly Child (TV story)"}) According to another account, the yearometer had been damaged on a previous expedition. (PROSE: Doctor Who in an Exciting Adventure with the Daleks [+]Loading...["Doctor Who in an Exciting Adventure with the Daleks (novelisation)"])
When the TARDIS arrived at Byzantium, the yearometer gave the date as 14 March 64. (PROSE: Byzantium! [+]Loading...["Byzantium! (novel)"])
When the TARDIS arrived at Marpling, the yearometer gave the date as 27 August 1933, though Anji Kapoor was incredulous that it was named this. (PROSE: Eater of Wasps [+]Loading...["Eater of Wasps (novel)"])
When Bill Potts questioned if they really were in an alternate 2017, and not the 22nd century, the Twelfth Doctor assured her that the TARDIS had a yearometer. (AUDIO: Emancipation of the Daleks [+]Loading...["Emancipation of the Daleks (audio story)"])