heliometer

/hee-lee-om-i-ter/US // ˌhi liˈɒm ɪ tər //UK // (ˌhiːlɪˈɒmɪtə) //

日照仪,日光仪,日照计,日照度计

Definitions

n.名词 noun

1
- : a telescope with a divided, adjustable objective, formerly used to measure small angular distances, as those between celestial bodies.

A rival method to that of the heliometer has been discovered in the photographic telescope.
On an entirely different plan is a survey just concluded by Chase with the Yale heliometer.
These require extension, because the differential methods of the heliometer and the camera cannot otherwise be made absolute.
The heliometer is a telescope with its object-glass cut in half along a diameter.
The instrument he is to use should be that marvellous piece of mechanical and optical skill known as the heliometer.