124. In the Bay of Fundy, during twilight, you a take sight of Mars. The sextant altitude (hs) is 03° 35.5'. Your height of eye is 32 feet and there is no index error. The air temperature is -10° C and the barometer reads 1010 millibars. What is the observed altitude (Ho)?

The observed altitude (Ho) is calculated by correcting the sextant altitude for dip, then applying the planet altitude correction, which accounts for refraction and parallax. Dip is subtracted based on the height of eye, and the planet correction is determined from tables using the apparent altitude, temperature, and pressure, resulting in Ho = 03 15.8'.