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L678, L687
Phases of the Moon
Hour hand
Day of the week aperture
Day of the week push-piece
Minute hand
Month aperture
30 minute counter
3-position crown
Calendar with hand
Chronograph seconds hand
Return-to-zero push-piece
for the chronograph hand
and counters
Start/stop push-piece.
Engagement and disengagement
push-piece for the chronograph
hand and counters
24-hour hand
Small seconds
12-hour counter
Phases of the Moon
1 2 3
B
A
C
98
Shows the hours, minutes, seconds, day, month, date and phases
of the Moon. Can be used to time events lasting up to 12 hours,
showing the result to 1/5
th
of a second.
3-position crown
Adjusting the time and stop seconds
(See page 66)
Quick adjustment of the date and month
Pull the crown right out to position 2 and turn it backwards to adjust
the date and month. Then push it back in to position 1. It is necessary
to adjust the date at the end of each month with less than 31 days.
Adjusting the phases of the Moon
Pull the crown out to the intermediate position 2 and turn it
forwards to adjust the phase of the Moon until the full moon
appears at the centre of the phases of the Moon aperture. Deter-
mine the date of the last full moon using a diary or calendar
indicating the dates of the full moon. Turn the crown forwards
again to the position indicated on the table of lunar months.
IMPORTANT! The date and the phases of the
Moon should not be adjusted between 7 p.m. and
6 a.m. as doing so may damage the mechanism.
Adjusting the day of the week
Push-piece C for adjusting the day of the week is situated at
10o’clock. Using the soft-pointed instrument provided by Longines,
press the push-piece to obtain the exact day.
Chronograph standard functions
(See page 80)
L678, L687 – PHASES OF THE MOON Automatic chronographs
02-English.indd 98 14.11.18 15:44