A.as the basis for star charts
B.to enter a star finder
C.in sight reduction using Pub 249
D.in sight reductions of planet observations
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A.calculating amplitudes
B.calculating great circle sailings by the Agiton method
C.entering the Air Navigation Tables (Selected Stars) Pub 249
D.plotting on star finders
A.refraction of light as it enters the Earth's atmosphere
B.rotation of the Earth on it's axis
C.the body's orbital motion during the time required for its light to reach Earth
D.a false horizon
A.is nearest to the Earth
B.is farthest from the Earth
C.is on the opposite side of the Earth from the Moon
D.and Moon and Earth are in line
A.Sirius
B.Canopus
C.Venus
D.Jupiter
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
最新試題
《航海天文歷》中列出的太陽出沒時刻是()
英版《潮汐表》中,潮高差是()
觀測天體高度前的準(zhǔn)備工作包括()①預(yù)求觀測時間②檢查秒表狀態(tài),使表時歸零③推算測天時的天文鐘鐘差④提前將六分儀拿到室外,適應(yīng)環(huán)境溫度⑤檢查校正六分儀誤差,調(diào)整好望遠鏡焦距
天體高度越(),蒙氣差越()。航海上通常避免選擇高度()的天體。
平放六分儀,刻度弧朝外將指標(biāo)桿移至(),眼睛置于動鏡后檢查六分儀的動鏡差。
在六分儀上直接讀取太陽的下邊緣觀測高度,并利用英版《航海天文歷》求太陽的真高度,則需要修正哪些誤差?()①器差②指標(biāo)差③眼高差④綜合改正⑤附加改正
使用航海六分儀測天時,不能用近物標(biāo)測定的指標(biāo)差作為觀測天體時的六分儀指標(biāo)差,是因為()
主、附港的潮時差為“-,說明()
航海六分儀的指標(biāo)差太大會給觀測帶來不便,因此當(dāng)指標(biāo)差大于()時,就應(yīng)該縮小它。
將觀測高度修正為真高度時,需要進行半徑差改正的天體是()