what does the sextant measure
You can use a sextant to determine the position (called the “shoot”) in the sky of the sun, moon, or other celestial body, as well as your longitude. Although its design looks complicated, with an understanding of how it works and practice, you can reliably use it to find your position. Ad.
A nocturnal penile tumescence (NPT) study or test is a simple way to determine whether you have erections at night when you are sleeping. If you do, there's a good chance that your erectile dysfunction (ED) is not caused by an organic disease such as heart disease. That's a good thing.