FLYBACK
The flyback function means exactly what it says, to
“fly backward”: it allows the wearer to move from
one chronograph reading to another in a single but-
ton push instead of three.
TACHYMETER
Scale used to measure speed in km/h. Start the
chronograph, walk or run exactly 1 km from your
point of departure. Look at the dial of your watch,
the seconds-hand uses the “tachymeter scale” to
indicate your speed in km/h for the kilometer you
just traveled.
TELEMETER
Scale used to measure the distance separating an
observer from a phenomenon which is first visible
and then audible. Its graduation is based on the
speed of sound (343 m/s).
For example, to determine a storm’s distance from
the wearer, start the chronograph at the first ap-
pearance of lightning; then stop it when the thunder
can be heard.
Look at the dial of your watch, the seconds-hand
uses the “telemetric scale” to indicate the distance
separating you from the place where the lightning
occurred.
MOON PHA SE
Watches with a moon-phase complication display
the cycles of the moon on their dial (first quarter,
full moon…). Moon phases are generally displayed
using a moving disk which makes one rotation every
lunar month (29 and one half day).
RETROGR ADE DISPL AY
A display is considered retrograde when one of the
hands (the retrograde hand) moves backward after
having reached its final mark and then begins the
cycle again.
ANNUAL CALENDAR
Annual calendar is a movement function which han-
dles the difference between 30 and 31-day months
automatically, without a manual date adjustment.
Only one adjustment per year is needed, at the end
of February.
JUMPING HOUR
Movement in which a disk numbered from 1 to 12
replaces the hour hand. The disk appears in an
aperture and instantly (jumps) to the next number
upon the hour.
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