A new system called the solar limbograph has been developed. This is a new reflective optical telescope with the best possible thermal properties, intended for high-accuracy measurements of the temporal variations of the shape of the limb and the diameter of the disk of the sun, as well as of the fine structure of individual active and quiet regions of the sun from on board a spacecraft. The optical system of the solar limbograph simulates an annular solar eclipse with an artificial moon mounted obliquely at the intermediate focus of its primary mirror.

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