- Struve, Hermann
- Summer, length of, on Mars
- Sun
- Surface, of Mars, features of
- Syrtis Major
- Tempe
- Terminator
- Tisserand, on polar flattening of Mars
- Titan, the
- Tithonius Lacus
- Trivium Charontis
- Twilight arc, of Mars
- Typhon, the, double
- Uranus
- Variations, of surface of Mars. (See Changes)
- Vegetation, on Mars
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