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Casio 3259 - PRG-250 Manual

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Operation Guide 3259
E-72
Reversing the Displayed Moon Phase
The left-right (east-west) appearance of the Moon depends on whether the Moon is north of you (northerly
view) or south of you (southerly view) as you view it.
You can use the procedure below to reverse the displayed Moon phase so it matches the actual
appearance of the Moon where you are located.
• To determine the viewing direction of the Moon, use a compass to take a direction reading of the Moon
at its meridian passage.
• For information about the Moon phase indicator, see “Moon Phase Indicator” (page E-73).
To reverse the displayed Moon phase
1. In the Tide/Moon Data Mode, hold down
E
until
SET Hold
appears
on the display and then the hour digits start to fl ash.
2. Press
D
twice.
• This will cause the Moon phase indicator to fl ash. This is the
indicator switching screen.
3. Press
A
to toggle the Moon phase indicator between the southerly
view (indicated by
) and northerly view (indicated by ).
• Northerly view: Moon is north of you.
• Southerly view: Moon is south of you.
4. When the Moon phase indicator setting is the way you want, press
E
to exit the switching screen and return to the Tide/Moon Data Mode
screen.
E-73
Moon Phases and Moon Age
The Moon goes through a regular 29.53-day cycle. During each cycle, the Moon appears to wax and
wane as the relative positioning of the Earth, Moon, and Sun changes. The greater the angular distance
between the Moon and the Sun,* the more we see illuminated.
* The angle to the Moon in relation to the direction at which the Sun is visible from the Earth.
This watch performs a rough calculation of the current Moon age starting from day 0 of the moon age
cycle. Since this watch performs calculations using integer values only (no fractions), the margin for error
of the displayed Moon age is ± 1 day.
Moon Phase Indicator
The Moon phase indicator of this watch indicates the current phase of the
Moon as shown below. It is based on the view of the left side of the moon
at meridian transit from the northern hemisphere of the Earth. If the
appearance of the Moon phase indicator is reversed from the actual
Moon as viewed from your location, you can use the procedure under “To
reverse the displayed Moon phase” (page E-72) to change the indicator.
Moon phase indicator
Moon age
Moon phase indicator
Moon age
E-74
Moon Phase
Indicator
Moon Age
Moon Phase
New
Moon
First
Quarter
(Waxing)
28.7-29.8
0.0-0.9
1.0-2.7 2.8-4.6 6.5-8.34.7-6.4 8.4-10.1 10.2-12.0 12.1-13.8
Moon Phase
Indicator
Moon Age
Moon Phase
Full
Moon
Last
Quarter
(Waning)
13.9-15.7
15.8-17.5 17.6-19.4 21.3-23.119.5-21.2 23.2-24.9 25.0-26.8 26.9-28.6
Moon phase (part you can see)(part you cannot see)
E-75
Tidal Movements
Tides are the periodic rise and fall of the water of oceans, seas, bays, and other bodies of water caused
mainly by the gravitational interactions between the Earth, Moon and Sun. Tides rise and fall about every
six hours. The Tide Graph of this watch indicates tidal movement based on the Moon’s transit over a
meridian and the lunitidal interval. The Tide Graph calculates and graphically represents current tide
conditions in your Home City or a port city in the vicinity of the Home City based on longitudes, lunar day
length, and lunitidal interval preset in watch memory, and on high tide times specifi ed by you.
Tide Graph
The Tide Graph graphically represents the current tide condition using one of three patterns that represent
spring tide, intermediate tide, and neap tide, as shown below.
Tide Name Graph Description
Spring Tide Large difference between high tide
and low tide. Occurs a few days
before and after a New Moon and
Full Moon.
Intermediate Tide Medium difference between high tide
and low tide.
Neap Tide Small difference between high tide
and low tide. Occurs a few days
before and after the fi rst quarter and
last quarter of a half moon.
E-76
• The Tide Graph fl ashes as shown below to indicate the tide range.
High tide
Low tide
Lunitidal Interval
Theoretically, high tide is at the Moon’s transit over the meridian and low tide is about six hours later.
Actual high tide occurs somewhat later, due to factors such as viscosity, friction, and underwater
topography. Both the time differential between the Moon’s transit over the meridian until high tide and the
time differential between the Moon’s transit over the meridian until low tide are known as the “lunitidal
interval”.
E-77
Using the Alarm
You can set fi ve independent daily alarms. When an alarm is turned on,
an alarm will sound for about 10 seconds each day when the time in the
Timekeeping Mode reaches the preset alarm time. This is true even if the
watch is not in the Timekeeping Mode.
You can also turn on an Hourly Time Signal, which will cause the watch
to beep twice every hour on the hour.
To enter the Alarm Mode
Use
D
to select the Alarm Mode (
ALM
) as shown on page E-16.
• About one second after
ALM
appears on the display, the display will
change to show an alarm number (
AL1
through
AL5
) or the
SIG
indicator. The alarm number indicates an alarm screen.
SIG
is shown
when the Hourly Time Signal screen is on the display.
• When you enter the Alarm Mode, the data you were viewing when you
last exited the mode appears fi rst.
Alarm number or SIG
Alarm time
(Hour : Minutes)
Current time
Alarm number or SIG
Alarm time
(Hour : Minutes)
Current time
E-78
To set an alarm time
1. In the Alarm Mode, use
A
and
C
to scroll through the alarm screens
until the one whose time you want to set is displayed.
AL1 AL2 AL3
SIG AL5
AL4
2. Hold down
E
until
SET Hold
appears on the display and then the
current settings start to fl ash.
• This is the setting screen.
3. Press
D
to move the fl ashing between the hour and minute settings.
4. While a setting is fl ashing, use
A
(+) and
C
(–) to change it.
• When setting the alarm time using the 12-hour format, take care to set the time correctly as a.m. (no
indicator) or p.m. (P indicator).
5. Press
E
to exit the setting screen.
Alarm ON/OFF
indicator
Alarm ON/OFF
indicator
E-79
To turn an alarm and the Hourly Time Signal on and off
1. In the Alarm Mode, use
A
and
C
to select an alarm or the Hourly Time Signal.
2. When the alarm or the Hourly Time Signal you want is selected, press
B
to turn it on and off.
•
An alarm on indicator will be on the display whenever any alarm (one
or multiple) is turned on. An hourly time signal on indicator is displayed
while the hourly time signal is on.
• If any alarm is on, the alarm on indicator is shown on the display in
all modes.
To stop the alarm
Press any button.
Hourly time signal
on indicator
Alarm on indicator
Hourly time signal
on indicator
Alarm on indicator
… 10 …


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