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.
The astrolabe, which preceded the sextant, works in a similar fashion. A sailor would line up the base line with the horizon and sight the height of the sun above the horizon at exactly noon. The resulting numbers could be used to calculate the shipâs current latitude. This astrolabe is believed to have been used between 1495 and 1500.