Telescope drawing12/8/2023 ![]() Debate centered on whether these were satellites of the Sun or actual spots on its surface. SunspotsĪlong with contemporaries such as Thomas Harriot, David Frabicius and Christoph Scheiner, Galileo observed dark regions that appeared to move across the surface of the Sun. Galileo rejected Tycho's model as an unnecessary hybrid and used the discovery to consolidate his support of the Copernican model. This could not be explained in the Ptolemaic model but could be accounted for by either the Sun-centered Copernican model or the Earth-centered Tychonic model that had the other planets orbiting the Sun as it orbited the Earth. Venus was observed to go through a sequence of phases similar to the Moon. Galileo's drawings of the moons of Jupiter of successive nights The Phases of Venus ![]() Have you made any sketches of Mars? We'd love to see them! Email them to us via article originally appeared in the October 2022 issue of BBC Sky at Night Magazine. The more you draw Mars, the more you will see! If your drawing was made using a filter, record that too. Once you’re comfortable sketching the Martian surface, you can go on to experiment with using different colour filters.īlue enhances white clouds, orange/red brings out any orange clouds. It was drawn with a mirror-inverting telescope (south up). Paul Abel sketched this map of Mars’s most well-known features (30° = 1 month). You can add other data like the value of the central meridian: this tells you which feature is on the north–south line at the time of your drawing. Finally, record the date, time (in UT) and telescope size and details.Complete your drawing within 12 minutes: any longer and Mars’s rotation will have significantly moved the features. The Martian limb may be quite bright if clouds are present. Add subtle features like clouds or delicate streaks. Now add the most prominent dark features, then the polar cap if you can see it.The terminator is not necessarily at right angles to the central meridian, so draw it carefully. ![]() Near opposition, Mars is 100% illuminated, but either side of opposition, the planet has a phase. What details are visible? Can you see a polar cap? Are there any prominent dark markings? What else can you see? Experiment with magnification so that the features are not too blurred.
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