Timepiece with indication of the part of the earth visible from the moon

A timepiece comprising a time base, a dial and time displaying means, which is controlled by said time base for indicating the current time, said timepiece further comprising astronomical display means for providing an indication on a map of the world, which is visible in at least one part of said dial, a part of the earth's surface visible from the moon at said current time, said indication of said part of the earth's surface recurring with a periodicity of substantially 24 hours, 48 minutes and 45.78 seconds.