At 39mm the watch features a monochrome dial with sweep seconds, moon-phase sector and date.

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The Waxing Gibbous Moon - the lunar phase between first quarter Moon and a full Moon - will be approximately one degree south of Jupiter appearing to be only a pen width apart.

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Unfortunately, his mnemonic would only work in the northern hemisphere, where the moon is observed in the southern sky with the right side of the moon sunward during the waxing phase and the left side sunward during the waning phase.

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The Economist can take solace that the original picture showing the waxing phase on the left side of the moon in Rio was indeed correct.

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The best time to gaze at the Moon through a telescope is when it is in a phase that is less than full, when the shadows along the terminator reveal in greatest detail the depression of craters.

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For its next phase, China plans to put rovers on the Moon to collect samples.

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That phase will last about three months, as the Moon completes three rotations beneath the orbits of the two satellites.

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Once the two GRAIL satellites are in orbit, their next step is to begin a five week phase in which they increase the speed at which they orbit the Moon.

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During the Apollo phase, the United States advanced very quickly, launching many missions which culminated in reaching the moon by a decade's end.

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