“True as the needle to the pole,
Or as the dial to the sun.”
Barton Booth (1681–1733) famous dramatic actor of the 18th century
Song, reported in Bartlett's Familiar Quotations, 10th ed. (1919). Compare: "True as the dial to the sun, Although it be not shin’d upon", Samuel Butler, Hudibras, Part iii, Canto ii, line 175.