Photoheliometer
Pho`to`he`li`om´e`ter
| n. | 1.(Astron.) A double-lens instrument for measuring slight variations of the sun's diameter by photography, utilizing the common chord of two overlapping images. |
| 单词 | photoheliometer | ||
| 释义 | PhotoheliometerPho`to`he`li`om´e`ter
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