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Nighthawk Series (mvt. cal. B877) Quick Identiication
Slide Rule
Inner Scale
Hour Hand
Crown 'B'
(used for rotating
Pilots Slide Rule
Dial Ring
Second Hand
24 Hour Hand (AM Side)
Pilots Slide Rule
Dial Ring (Outer Scale)
Minute Hand
Date
Crown 'A'
(used for setting
time/date functions)
24-Hour Hand (PM Side)
24-Hour Time 'AM' Scale
24-Hour Time 'PM' Scale
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Related Manuals for Citizen Nighthawk Series
Summary of Contents for Citizen Nighthawk Series
- Page 1 Nighthawk Series (mvt. cal. B877) Quick Identiication 24 Hour Hand (AM Side) Minute Hand Slide Rule Inner Scale Date Crown ‘A’ Hour Hand (used for setting time/date functions) 24-Hour Hand (PM Side) 24-Hour Time ‘AM’ Scale Crown ‘B’ (used for rotating 24-Hour Time ‘PM’...
- Page 2 Nighthawk Series (mvt. cal. B877) Quick Reference 24 Hour Hand (AM Side) Slide Rule Minute Hand Inner Scale Date Hour Hand Crown ‘A’ (used for setting time/date functions) 24-Hour Hand (PM Side) 24-Hour Time ‘AM’ Scale Crown ‘B’ (used for rotating Pilots Slide Rule Dial 24-Hour Time ‘PM’...
- Page 3 Movement Caliber B877 Quick Setting Instructions 24-Hour Hand (AM Side) White tip indicates PM time (12:00 AM to 11:59 AM) Minute Hand Date Indicator Hour Hand Crown ‘A’ 24-Hour Hand (PM Side) Red tip indicates PM time (12:00 PM to 11:59 PM) Crown ‘B’...
- Page 4 Use of the Navigation Calculator Speed Index on Inner Scale (triangle mark at 12:00 position) Flying distance and other navication calculations as well as mark on Inner Scale general calculations can be performed using the slide rul located around the dial. This slide rule is not capable of mark on Outside Scale displaying decimal places, and as such, should only be used...
- Page 5 3. Flying Distance Calculation Question : What is the flying distance traveled in 40 minutes at a speed of 210 knots? Solution: Rotate the lower left crown in either direction to align the '21' on the Outside Scale with the 'Speed Index' on the Inside scale.
- Page 6 6. Maximum flying hours Question : With a fuel consumption rate of 220 gallons per hour and a fuel supply of 550 gallons, what is the maximum flying hours? Solution: Rotate the lower left crown in either direction to align the '22' on the Outside scale with the 'Speed Index' of the inside scale.
- Page 7 2. Division Question: What is 250 divided by 20 (250 / 20)? Solution: Rotate the lower left crown in either direction to align the '25' on the Outside Scale with '20' on the inside scale. Read the '12.5' mark that is aligned with the ' ' mark on the Inside Scale.
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Questions and answers
What is the function of the hand between hour and minute hands (the red one)
The red hand on the Citizen Nighthawk Series watch is the PM side of the 24-hour hand. It indicates PM hours (12:00 PM to 11:59:59 PM) and helps distinguish between AM and PM time.
This answer is automatically generated