Make arrangements to view Jupiter’s Great Red Spot through a telescope. Consult the Sky & Telescope Web site, which lists the times when the center of the Great Red Spot passes across Jupiter’s central region, as seen from Earth. The Great Red Spot is well placed for viewing for 50 minutes before and after this time. You will need a refractor with an objective lens of at least 15 cm (6 in.) diameter or a reflector with an objective of at least 20 cm (8 in.) diameter. Using a pale blue or green filter can increase the color contrast and make the spot more visible. For other useful hints, see the article “Tracking Jupiter’s Great Red Spot” by Alan MacRobert (Sky & Telescope, September 1997). Sketch Jupiter based on your observations.
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