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| Title | Equation | Description | Further Reading |
|---|---|---|---|
| Distance Calculation using Parallax |  Equation 10 - Distance Calculation using Parallax | The distance to an object in parsecs is equal to 1 AU over the parallax in arc seconds. | |
| Angular Size Calculation |  Equation 12 - Angular Size Calculation | Calculate the angular size of an object based on its apparent size and distance between measure and observer, where theta is the angular size in radians, Sap is the apparent size in mm and l is the distance between the measure and the observer. | Newton's law of universal gravitation is stated as every particle in the universe attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres. What is Angular Size in Astronomy? |
- Distance between the two point masses [Units: m]
Newton's law of universal gravitation states that two objects are attracted to each other by a force which is proportional to the product of their masses and inversely proportional to the square of the distance between them. It bears a close resemblance to Coulomb's law in electrostatics,
