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To add what Malcolm has said, seeing is important. A 90mm refractor is capable of excellent planetary views, but there are a few do's and don'ts to follow. Do observer when the planet is as high as possible in the sky. The less murkosphere to look through the better. Don't observe over a hot road, roof, driveway or parking lot after sunset. The heat shimmering will kill any detail present. A grassy field is best but even these can produce thermals if hot enough.
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