NAV CEL. NAV. 1-50

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  • 1. Tide Tables tabulate sunrise and sunset from latitudes: A. 88 N to 88 S B. 60 N to 60 S C. 76 N to 60 S D. 47 N to 50 S

  • 2. A light observed below the horizon or hidden by obstacles and emits a glow called: A. Halo B. Loom C. Corona D. Aurora borealis

  • 3. In lat. 75 N, dec of sun 15 S, which of the following occurs? A. Sun crosses the prime vertical twice B. Sun will not cross the prime vertical C. Sun crosses the prime vertical once D. None of the above

  • ZNaHSHNPNPSQQddLAT 75 NDEC 15 S

  • 4. In lat. 7 N, dec of sun 0, which of the following occurs? A. Sunrise before 0600 hrs B. Sunrise after 0600 hrs C. Sunrise at 0600 hrs D. None of the above

  • 5. In lat. 7 N, dec of sun 5 S, which of the following occurs? A. Sun will not cross the Prime Vertical B. Sun crosses the Prime Vertical once C. Sun crosses the Prime Vertical twice D. None of the above

  • ZNaHSHNPNPSQQddLAT 7 NDEC 5 S

  • 6. In lat. 75 N, dec of the sun 16 N, which of the following occurs? A. It is total darkness whole day B. It is total daylight whole day C. The sun will be below the horizon whole day D. None of the above

  • ZNaHSHNPNPSQQddLAT 75 NDEC 16 N

  • 7. The polar distance can never be more than: A. 90 B. 270 C. 180 D. 360

  • 8. Which star in nearest to the earth? A. Vega B. Altair C. Sun D. Sirius

  • 9. The LHA minus the GHA is: A. Longitude B. Meridian angle C. Right ascension D. None of the above

  • 10. This is a small circle parallel to the celestial equator: A. azimuth circle B. vertical circle C. altitude D. declination

  • 11. The time of sunrise when the vessel was at the Tropic of Capricorn on or about Sept. 21. A. 0818 B. About 0800 C. 0618 D. About 0600

  • NSEQEQ2327N2327S6633N6633STROPIC OF CANCERTROPIC OF CAPRICORNARCTIC CIRCLEANTARCTIC CIRCLE

  • ZNaHSHNPNPSQQddLAT 23 27STropic of CapricornDEC 0

  • 12. Which of the following is true about SHA? A. Angular distance of a star east of Aries B. Angular distance of a star east of the meridian C. Angular distance of a star west of Aries D. Angular distance of a star west of the meridian

  • 13. In lat. 40 N, dec 20 N, the sun will: A. cross the prime vertical twice B. cross the prime vertical once C. cross the prime vertical when sunrise D. cross the prime vertical when sunset

  • ZNaHSHNPNPSQQdLAT 40 NDEC 20 N d

  • 14. When the observer is on the equator which of the following is true? A. Day and night are equal B. Day is shorter than night C. Night is shorter than day D. Day is longer than night

  • 15. In lat. 40 N, dec 20 S, which of the following occurs? A. Sun will continuously be below the horizon B. Day is longer than night time C. Day is shorter than night time D. Sun will be touching the horizon whole day

  • ZNaHSHNPNPSQQddLAT 40NDEC 20S

  • 16. In lat. 5 N, dec 7 N, which of the following occurs? A. Sunrise after 0600 B. Sunrise before 0600 C. Sunrise at 0600 D. None of the above

  • ZNaHSHNPNPSQQddLAT 5 NDEC 7 NddDEC 7 S

  • 17. In the Nautical Almanac, the GHA for the sun is tabulated for the: A. mean sun B. apparent sun C. true sun D. both b & c

  • 18. Observed altitude is: A. apparent altitude corrected for parallax and semi-diameter B. sextant altitude corrected for parallax and semi-diameter C. altitude of the suns lower limb D. computed altitude corrected for dip

  • 19. The time given in the Nautical Almanac for Meridian Passage is in: A. ZT B. LMT C. GMT D. LAT

  • 20. Northern lights are also known as: A. aurora borealis B. corona C. aurora australis D. halo

  • 21. A luminous phenomena due to electrical charges in the atmosphere is called: A. corona borealis B. corona C. aurora D. aureole

  • 22. Which of the following occur if your vessel was at the Tropic of Cancer on Sept. 21? A. The sun will cross the prime vertical at the horizon B. The sun will not cross the prime vertical C. The sun will cross the prime vertical above the horizon D. The sun will cross the prime vertical below the horizon

  • ZNaHSHNPNPSQQddLAT 23 27NTropic of CancerDEC 0

  • 23. The observers Zenith at lat. 60 N is: A. 60 N of the celestial equator B. 30 N of the geographical equator C. 30 N of the celestial equator D. 60 N of the geographical equator

  • 24. The sun will stay at the horizon the whole day if: A. the observer is at the South Pole on or about June 21 B. the observer is at the North Pole on or about June 21 C. the observer is at the North Pole on or about Dec. 21 D. the observer is at the South Pole on or about Sept. 21

  • ZNaHSHNPNPSQQddLAT 90 00SSEPT. 21DEC = 0

  • 25. What is Right Ascension? A. Angular distance of a celestial body west of Aries B. Angular distance of the sun east of the meridian C. Angular distance of a celestial bodies east of Aries D. Angular distance of the star east of the meridian

  • 26. In the daily pages of the Nautical Almanac the d correction is the declination change during: A. 1200 and 1300 B. 0000 and 1200 C. 2300 and 0100 D. 0600 and 1800

  • 27. The height of eye is applied to the apparent altitude: A. before correcting for index error B. after correcting for index error C. after correcting for parallax D. cannot apply

  • 28. The first point of Aries is subtracted from GHA, result is: A. SHA B. meridian angle C. LHA D. right ascension

  • 29. The body touches the prime vertical when the: A. latitude is less than the declination with opposite names B. latitude and declination are equal and same name C. latitude is more than the declination, same name D. latitude and declination are equal opposite names

  • 30. Observer at the north pole on March 21, which would occur? A. the sun will continuously be below the horizon during the day B. the sun will continuously be above the horizon during the day C. the sun will continuously be on the horizon during the day D. none of the above

  • ZNaHSHNPNPSQQddLAT 90 00nMAR. 21DEC = 0

  • 31. Observer on the north pole on Sept. 21, which would occur? A. the sun will continuously be below the horizon during the day B. the sun will continuously be on the horizon during the day C. the sun will continuously be above the horizon during the day D. none of the above

  • ZNaHSHNPNPSQQddLAT 90 00nSEPT. 21DEC = 0

  • 32. Observer on the North Pole on June 21, which would occur? A. the sun will be above the horizon during the day B. the sun will be below the horizon during the day C. the sun will be on the horizon during the day D. none of the above

  • ZNaHSHNPNPSQQddLAT 90 00nJUNE. 21DEC = 23 27N

  • 33. Observer on the north pole on December 21, which would occur? A. The sun will be below the horizon during the day B. The sun will be on the horizon during the day C. The sun will be above the horizon during the day D. None of the above

  • ZNaHSHNPNPSQQddLAT 90 00nDECEMBER.21DEC = 23 27N

  • 34. Which of the four adjustable errors in the sextant causes side error? A. Index mirror not being perpendicular to the frame B. Telescope not being parallel to the frame C. Elliptical centering error D. Horizon glass not being perpendicular to the frame

  • 35. 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: A. index error B. prismatic error C. perpendicularity of the horizon glass D. perpendicularity of the index mirror

  • MARINE SEXTANTADJUSTABLE ERROR1. Collimation Error2. Index Error3. Perpendicularity Error ( Horizon )4. Perpendicularity Error ( Index )NON - ADJUSTABLE ERROR1. Prismatic Error2. Centering Error3. Graduation Error

  • 36. The difference (measured in degrees) between the GHA of the body and the longitude of the observer is the: A. Right ascension B. Meridian angle C. SHA of the observer D. Zenith distance

  • 37. What is the longitude of the geographical position of a body whose Greenwich hour angle is 310 30? A. 30 30 E B. 49 30 E C. 120 30 W D. 149 30 E

  • 38. If the suns observed altitude is 52 50, the zenith distance is: A. 38 10 B. 37 10 C. 47 50 D. 127 10

  • 39. The difference of latitude between the geographic position of a celestial body and your position, at the time of upper transit, is represented by: A. zenith distance B. co-distance C. co-latitude D. altitude

  • 40. If the suns observed altitude is 28 12, the zenith distance is: A. 62 48 B. 151 48 C. 61 48 D. 43 12

  • 41. A semi diameter correction is applied to observations of: A. Mars B. The moon C. Jupiter D. All of these

  • 42. The error in the measurement of the altitude of a celestial body, caused by refraction, increases as the: A. horizontal parallax decr