Mars is longer than Mercury: 687 days vs 88 days. The difference is 599 days, so Mars is about 7.8 times the value of Mercury.
| Item | Value | Position in ranked list |
|---|---|---|
| Mercury | 88 days | 1 of 8 |
| Mars | 687 days | 4 of 8 |
Values are approximate and rounded. This comparison comes from the list "planets by length of year (orbital period), shortest first" (8 items, position 1 is first in that order).
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