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Following up on Christian's comment about seven day weeks... your aliens could use any base you want, for the same reason weeks have seven days: because their deity/religion said to do that. (This ...
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#1: Attribution notice removed
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System
·
2020-12-01T17:59:12Z (almost 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/154026 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/