“https://www.mathsisfun.com/
“ANGLE OF ELEVATION: The angle formed by the line of sight and the ‘HORIZONTAL PLANE‘ for an object above “THE HORIZONTAL“
https://www.merriam-webster.
“Measurement of the ELEVATION ANGLE:
…. Elevation Angles !!! …“In the hands of the practiced observer, the modern SEXTANT can be used to measure **’ELEVATION ANGLES** with an accuracy of 10 seconds of arc—that is, close enough to determine a ship’s north-south position within a few hundred metres.”
https://www.britannica.com/
“All the observer does now is to use a SEXTANT to measure the **’ANGLE OF ALTITUDE**[ ELEVATION ANGLE ] H of the noon sun with respect to *HORIZON*, and to record the exact time of this measurement.”
https://princetonastronomy.
CONCLUSION: You MUST HAVE *‘HORIZONTAL PLANE‘ BASE LINES*
(‘The Adjacent’) to obtain **’ELEVATION ANGLES** using a SEXTANT .
ERRRR… There are *NO* *‘HORIZONTAL PLANES‘* on a Spinning Monkey Ball !!
ERGO… The EARTH *IS NOT* a Spinning Monkey Ball. 
FROM… Jacoby, Harold (Professor of Astronomy, Columbia University); Navigation: Chapter VI, **THE SEXTANT**; Cornell University Library, 1918, pg. 61 …
**ATTENTION TO ALL FLAT EARTHERS:**
1. Are Sextants used by mariners to successfully navigate using the relationship between the Earth's Surface and Celestial Objects ?
YES !
2. Are Sextants used to obtain Elevation Angles from your position to Celestial Objects ?
YES !
3. Can you obtain an Elevation Angle from a Curved Adjacent (Curved Baseline) – SPHERICAL Surface ?
NOPE !
The End.
It’s ALL OVER BallTAAAAAAAARDS !!!
( with an itty bitty **’RIGHT TRIANGLE’ !!!!** )
