Citizen CC4054-68L Instruction Manual page 52

Receiving time information
Automatic time reception
The watch starts time reception automatically when the conditions belows are
fulfilled:
• The watch has not received satellite signals for 6 or more days.
• The watch dial is being exposed to strong direct sunlight for 20 seconds or more.
• The crown is in position 0 and the mode is [ TME ] or [ UTC ]
• The time of the home time is between 6:00AM and 6:00PM.
• The second hand does not move in two-second interval (page 64).
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