The water content of moist air can be measured with no less than six different metrics: Wet Bulb Temperature, Relative Humidity, Absolute Humidity, Degree of Saturation, Humidity Ratio (also known as Mixing Ratio), and Specific Humidity.
You can use a sextant to determine the position (called the âshootâ) 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.
Corrections to a Sextant Altitude. Index Error. This error can be found using the horizon. The sextantâs altitude is set to zero and then the two images of the horizon are aligned. The Index Error can then be read off. If the sextant altitude reads high, the correction is subtractive and termed âOn the Arc.â âOff the Arcâ is the opposite. After Index Error has been applied, the Sextant Altitude it is referred to as the Observed Altitude. Dip/ Height of Eye. The True Horizon is at 90Â° to the Earthâs gravitational field.