Figure 1: The angular declination hypothesis. Figure 2: The effect of viewing through a pair of 10 PD base-up prisms and the after-effect of adaptation to base-up prisms on judged distance in the ...

A SYSTEM of dividing the year into 16 periods, each denned by certain solar declination values having numerically equal positive and negative magnitudes, has been discussed by me in an earlier ...

Migratory Eurasian Reed Warblers Can Use Magnetic Declination to Solve the Longitude Problem. Current Biology, 2017; DOI: 10.1016/j.cub.2017.07.024 ...

We designed and constructed a sundial for the purpose of observing the declination of the sun and thus marking solar seasonal variation. The 122 × 122 cm vertical sundial on the south-facing wall of ...