NAV 4
問題一覧
1
What part of sextant is of the metal variety, constructed of thin strip of metal which has a low coefficient of expansion. It is ''let in'' flush with the ''lowet limb'' of the sextant and is graduated from 0° to 120° ''on the arc'' and from 0° to -5° '' off the arc''
ARC
2
What is angular distance of the body above the horizon. Position line may be drawn on the map or chart?
altitude
3
What is the point at which the moon is farthest from the earth?
apogee
4
Convert 2°-35' to time units.
10 minutes. 20 secs.
5
What is the angular distance west of the local celestial meridian measured westward from the local celestial meridian through 360°?
local hour angle
6
Your position is 80°-00'N and 120°-20'E. What is your Local Mean Time.
08h-01m-20s
7
What do call the point at which the moon is nearest from the earth is known as?
perigee
8
What star often call as North Star, is treated specially due to its proximity to the north celestial pole?
polaris
9
Your position is 08°-00'N and 120°-20'E. What is your Zone Description.
Zd=-08
10
What is the magnitude during full moon?
-12.6
11
What do you call a reference tool for maintaining bearing of a vessel at sea?
pelorus
12
What is the famous set of mathematical table was first published in 1803. It has been a bestseller ever since, and despite developmens in electronic navigation?
norie's table
13
What table are givennfor usage in calculating the LMT of sunrise,sunset, twilight, moonrise, moonset, and moon's pass for the required latitude?
interpolations table
14
Vessel on position 26°-00.0N and longitude 030°-00.0W, Declination=07°-57.9' with correction 0.3 increasing and the sun is setting. What is your True Bearing?
278.9 degrees
15
What is the method for determining longitude up to the 17th century? The time of the eclipse for the reference meridian could be calculated in advance.
Method of Timing Lunar Eclipse
16
What correction should be applied to Magnetic Bearing to obtain your True Bearing?
variation
17
What is the average True Solar Time over the year making this time scale more uniform by eliminating the effects of the non-uniform, revolution of the Earth around the sun?
mean solar time
18
What is a publication describing the positios of a selection of Celestia Bodies for the purpose of enabling navigator to use celestial navigation to determine the position of their ship while at sea?
nautical almanac
19
What part of sextant has five or six graduatios which correspond 0.2' or 10'' of arc respectively?
micrometer vernier
20
What isbthe correct formula for solving amplitude value?
Sin Ampl= Sin decl/cos Lat
21
What mathematical basis of sight reduction is the circle of equal altitude? The calculation can be done by computer, or b7 hand via tabular methos and longhand methods.
algorithm
22
What part of sextant protecs the eye of an observer from sun rays?
shade glasses
23
what sine value you are calculating when using formula sin(Lat) x sin( Dec) +b(Lat) x cos(Dec)x cos(LHA
hc
24
What isnthe value of Meridian angle(t) if LHA greater than 180 degrees?
360°-LHA
25
What is the oldest known instrument for telling time, allows us to teack the position of the sun and more accurately?
sundial
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20問 • 1年前問題一覧
1
What part of sextant is of the metal variety, constructed of thin strip of metal which has a low coefficient of expansion. It is ''let in'' flush with the ''lowet limb'' of the sextant and is graduated from 0° to 120° ''on the arc'' and from 0° to -5° '' off the arc''
ARC
2
What is angular distance of the body above the horizon. Position line may be drawn on the map or chart?
altitude
3
What is the point at which the moon is farthest from the earth?
apogee
4
Convert 2°-35' to time units.
10 minutes. 20 secs.
5
What is the angular distance west of the local celestial meridian measured westward from the local celestial meridian through 360°?
local hour angle
6
Your position is 80°-00'N and 120°-20'E. What is your Local Mean Time.
08h-01m-20s
7
What do call the point at which the moon is nearest from the earth is known as?
perigee
8
What star often call as North Star, is treated specially due to its proximity to the north celestial pole?
polaris
9
Your position is 08°-00'N and 120°-20'E. What is your Zone Description.
Zd=-08
10
What is the magnitude during full moon?
-12.6
11
What do you call a reference tool for maintaining bearing of a vessel at sea?
pelorus
12
What is the famous set of mathematical table was first published in 1803. It has been a bestseller ever since, and despite developmens in electronic navigation?
norie's table
13
What table are givennfor usage in calculating the LMT of sunrise,sunset, twilight, moonrise, moonset, and moon's pass for the required latitude?
interpolations table
14
Vessel on position 26°-00.0N and longitude 030°-00.0W, Declination=07°-57.9' with correction 0.3 increasing and the sun is setting. What is your True Bearing?
278.9 degrees
15
What is the method for determining longitude up to the 17th century? The time of the eclipse for the reference meridian could be calculated in advance.
Method of Timing Lunar Eclipse
16
What correction should be applied to Magnetic Bearing to obtain your True Bearing?
variation
17
What is the average True Solar Time over the year making this time scale more uniform by eliminating the effects of the non-uniform, revolution of the Earth around the sun?
mean solar time
18
What is a publication describing the positios of a selection of Celestia Bodies for the purpose of enabling navigator to use celestial navigation to determine the position of their ship while at sea?
nautical almanac
19
What part of sextant has five or six graduatios which correspond 0.2' or 10'' of arc respectively?
micrometer vernier
20
What isbthe correct formula for solving amplitude value?
Sin Ampl= Sin decl/cos Lat
21
What mathematical basis of sight reduction is the circle of equal altitude? The calculation can be done by computer, or b7 hand via tabular methos and longhand methods.
algorithm
22
What part of sextant protecs the eye of an observer from sun rays?
shade glasses
23
what sine value you are calculating when using formula sin(Lat) x sin( Dec) +b(Lat) x cos(Dec)x cos(LHA
hc
24
What isnthe value of Meridian angle(t) if LHA greater than 180 degrees?
360°-LHA
25
What is the oldest known instrument for telling time, allows us to teack the position of the sun and more accurately?
sundial