# Section I: Observations and Corrections

Section I of the Sight Reduction Form is used to calculate the ** Observed Altitude** (

*ho*), which is used in Section IV to calculate the

**.**

*Altitude Intercept*- We’ll look at Choosing a Celestial Body in our first video, and for the scope of this course we will limit ourselves to celestial bodies that require minimal corrections.
- Our second video explains how to calculate the Apparent Altitude, detailing
*Index Correction*,*Dip Correction*, and*Sextant Altitude*. - For our third and final video in Section I, Observed Altitude focuses on adding or subtracting any additional corrections to our
to complete our calculations for this section.**Apparent Altitude**

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