3 ms·
One of these (or a cheaper version) would work even better than a clock for every city you care about... https://www.geochron.com/ https://www.geochron.com/
by tlrobinson 10y ago
One of these (or a cheaper version) would work even better than a clock for every city you care about... https://www.geochron.com/ https://www.geochron.com/