Apparent altitude is sextant altitude corrected for（）.<br>A:parallax and personal error<br>B:inaccuracies in the reading and reference level<br>C:visibility and magnitude<br>D:All of the above are correct

Apparent altitude is sextant altitude corrected for（）.
A:parallax and personal error
B:inaccuracies in the reading and reference level
C:visibility and magnitude
D:All of the above are correct

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