801) If the zenith distance is 0 deg the body is at prime vertical
802) If the zenith distance is 0 degrees the body is at prime vertical
803) Celestial sphere is defines as __________. the imaginary sphere of infinite radius with the earth at its center
804) Celestial sphere is defined as. the imaginary sphere of infinite radius with the earth at its center
805) The axis of the earth is undergoing processional cycle every 25,800 years
806) The axis of the earth is undergoing processional cycle every. 25,800 years
807) The error in the measurement of the altitude of a celestial body, caused by refraction, increases as the _______________? altitude of the body decreases
808) The angular distance from the prime vertical to the hour circle of the body, prefix name of meridian angle east if rising and west if setting and suffix the name of the declination is Amplitude
809) The angular distance of a celestial body north or south of the prime vertical amplitude
810) The effect of wind in an exposed areas of a ship is most noticeable when the vessels is. backing
811) The imaginary path of the earth in its 365.25 days travel around the sun is called ecliptic
812) The imaginary path of the earth in its 365.25 travel around the sun is called ecliptic
813) The physical reason why the earth's axis point to the constant direction of the North star Polaris is due to _________] gyroscopic inertia
814) The physical reason why the earth's axis point to the constant direction of the North Star, Polaris is due to gyroscopic inertia
815) The planet that can be seen to the month of January for more than half of the night in Leo, its Westward elongation gradually increases until it is at opposition on February 29 Jupiter
816) This is a small constellation representing a hare hiding under the feet of Orion Lepus
817) This is the time required for a light to travel from any celestial object to the earth light time
818) This is the time required for a light to travel from any celestial object to the earth. light time
819) Winter solstice occurs on or about December 22
820) Winter solstice occurs on or about December 22
821) The parallel about 23deg27' from the poles __________.__ polar circles
822) Which of the following in relation to the geographic position, the celestial body is not correct? the altitude of the body to an observer 300 miles away where the body is on the zenith, will be 85 deg
823) The parallel about 23.5 degrees north, and is the northern limit of the torrid zone ______ Tropic of Cancer
824) An "off the arc" error of a sextant means? positive correction
825) The correction(s) which must be applied to an aneroid barometer reading include(s) __________. height error
826) The horizon glass of a sextant is __________. silvered on its half nearer the frame
827) There are seven sources of error in the marine sextant. Of the four errors listed, which one is adjustable? Error of collimation
828) What causes the error of collimation with regards to the four adjustments to a sextant? Telescope not parallel to the frame
829) What is a nonadjustable error of the sextant? Prismatic error
830) Which of the four adjustable errors in the sextant causes side error? Horizon glass not being perpendicular to the frame
831) When taking an amplitude, the Sun's center should be observed on the visible horizon when __________. in high latitudes
832) When taking stars, those bodies to the east and west will __________. change altitude rapidly
833) When correcting the sextant altitude to apparent altitude you are correcting for inaccuracies in the reading and __________. for inaccuracies in the reference level
834) Why are low altitude sun sights not generally used? Errors due to unusual refraction may exist.
835) It is an error on a sextant wherein the horizon and the index mirror are not parallel when set to zero. Index error
836) A sextant error when the pivot of the Index bar is not at the center of the arc centering error
837) The part of a sextant mounted directly over the pivot of the index arm is the __________. index mirror
838) Apparent altitude is sextant altitude corrected for __________. inaccuracies in the reading and reference level
839) Because of the reflecting properties of a sextant, if the sextant altitude reads 60° on the limb, the actual arc of the limb from 0° to the 60° reading is __________. 30°
840) For a well made and well maintained sextant, the maximum value of which correction is usually so small that it can be ignored? Instrument correction
841) In order to remove index error from a sextant, you should adjust the __________. horizon glass to make it parallel to the index mirror with the index set at zero
842) The marine sextant is subject to seven different types of errors, four of which may be corrected by the navigator. An error NOT correctable by the navigator is __________. prismatic error
843) When applying a dip correction to the sighted sextant angle (hs), you always subtract the dip because you are correcting __________. hs to the sensible horizon
844) Which of the four adjustable errors in the sextant is the principle cause of index error? Index mirror and horizon glass not being parallel
845) On 21 January 1981, you take a back sight of the Sun's upper limb as it appears in the scope. The sextant altitude (hs) is 121°31.5'. The index error is 2.5' on the arc. The height of eye is 31 feet (9.3 meters). What is the observed altitude (Ho)? 58°53.1'
846) On 25 December 1981 you observe the Sun's lower limb. The sextant altitude (hs) is 4°06.9'. The height of eye is 47 feet and the index error is 1.6' on the arc. The temperature is 19°F. and the barometer reads 1030.8 millibars. What is the observed 4°01.9'
847) A marine sextant has the index arm set at zero and the reflected image of the horizon forms a continuous line with the actual image. When the sextant is rotated about the line of sight the images separate. The sextant has __________. side error
848) The error in a sextant altitude caused by refraction is greatest when the celestial body is __________. near the horizon
849) The major problem with Moon sights is the __________. lack of a well defined limb during certain phases and positions in the sky
850) What sextant correction corrects the apparent altitude to the equivalent reading at the center of the Earth? Parallax
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