Part 2. Recent and historical images of Mars
Historical Image of Mars. Website reference: http://www.fourthplanet.space/tag/christiaan-huygens/
Image info: Christiaan Huygens’ observational drawing of Mars shows a triangular feature which known today as Syrtis Major.
Telescope used: Huygens used a telescope created by himself (1655). It was a good 2-inch (5.1-cm) telescope of 10.5-foot (3.2-m) focal length and 50x magnification. (Sheehan)
Observer: Christiaan Huygens
Exposure time: Observations were taken over a number of weeks. Other relevant details: Huygens used results of his observations of Mars to measure Mars’ rotational period. He measured it as 24 hours (only one hour away from the rotational period of the planet recognized today). It should be noted that the most prominent and largest crater of the Mars was named after Huygens (14.0°S, 304.4° ...