Seriously, don't build stuff below sea level. Bad, wrong, wrong, bad.
As a Dutch, I feel chastised. Although I would understand when it comes to
ExxonMobile.
See, 13 months of four seven-day weeks each would almost work. Almost. Leaves you wanting for one day. Two on leap years. Yeah, we need to speed up the Earth's path around the Sun a bit. Maybe move it closer? I see no downside to this plan.
Before the flood, in the legends of old, we had a 360 days/year. And the earth was not tilted. And the earth had no oceans, just sea's and there was vegetation all over the planet. Then something happened. Some blame the aggresive Atlanteans, some blame a meteorite.
This site has a list of all cultures still remembering 360:
https://www.360dayyear.com/
I've read in the past more about this (
in this book) it basically says not to mess with the planetary orbits because of the math that has too many dependant variables and we can not solve these yet (or ever).
The 'xiuhpohualli' was a civil as well as religious
calendar comprising 365
days. These were divided into 18 'months' of 20
days each, giving a total of
360 days. To complete the year, a group of
5 days called 'nemontemi' or seriously unlucky
days was added.
if solar year were exactly
360 days (instead 365.25) and lunar cycle were 30
days (instead of 29.53) we would have a "perfect
calendar" based on 12 months of 30
days per month. Such
calendar would would have perfect sync of the 12 lunar cycles with the solar year of
360 days.