Wednesday 4th February 2026

• Telescope 80–100 mm
  Enough to see Ganymede, its shadow, and the GRS, though with limited detail.
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• Increase magnification (Telescope)
  Around 120×–180× gives a good balance of detail and stability.
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• Wait for steady moments:
  The shadow is easiest to see when the atmosphere briefly calms.
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• Look for contrast
  Ganymede’s shadow appears as a small, sharp dark dot on Jupiter’s cloud tops.
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• GRS timing
  The Great Red Spot is easiest when it’s near the centre of Jupiter’s disc.
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