• (n.) A double-lens instrument for measuring slight variations of the sun`s diameter by photography, utilizing the common chord of two overlapping images.
Found on
http://thinkexist.com/dictionary/meaning/photoheliometer/
Pho`to·he`li·om'e·ter noun [
Photo- +
heliometer .]
(Astron.) A double- lens instrument for measuring slight variations of the sun's diameter by photography, utilizing the common chord of two overlapping images.
Found on
http://www.encyclo.co.uk/webster/P/77
No exact match found.
