A.the declination is the opposite name to the latitude B.the algebraic sum of the colatitude and declination exceeds 90 C.the observer is in high latitudes above either polar circle D.the body is circumpolar
A.when the declination and latitude are of different names B.when the declination is greater than and the same name as the latitude C.if the vessel is stopped or making bare steerageway D.on a fast vessel on northerly or southerly headings
A.opposition B.west quadrature C.apogee D.inferior conjunction
A.From every fix or running fix B.From every estimated position C.Every three minutes in pilotage waters D.Only in pilotage waters
A.glare from background lighting B.existing visibility conditions C.elevation of the light D.observer's height of eye
A.cluster B.shower C.constellation D.galaxy
A.odd or even numbers B.the color of their top band C.the location of the buoy in the channel junction D.the buoy's light rhythms
A.getting B.setting C.being D.having
A.White buoy with a green top B.White and international orange buoy C.Yellow buoy D.Yellow and black vertically-striped buoy
A.the Sun，Earth，and Moon are at right angles B.the Sun's declination is 0°and is moving south C.an inferior planet is at the maximum angle to the line of sight to the Sun D.the Earth is between a planet and the Sun
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