An orbit is a continuous path of an object revolving around a star or planet. Geosynchronous orbits are useful as objects in this orbit will appear stationary from Earth's surface. The moon takes approximately 27 days to orbit Earth as measured by the stars (sidereal month) or between new moons (synodic month). Solar and lunar eclipses occur when the sun, moon, and Earth are aligned so that one casts its shadow on the other. Eclipses can be total, partial, or annular depending on the alignment and distance of the bodies. Electric charge is a physical property that causes objects to experience electric force, and Coulomb's law describes the relationship between charge magnitudes and electric force. Triboe

1. Physics
An orbit is a continuous path of an object going around a star, planet, or moon.
One very useful sort of orbit is a geosynchronous orbit
The moon takes 27.321661 days to make one full revolution with respect to the stars, and
that is called the sidereal month.
the time from one new moon to the next new moon, which is known as the synodic month.
A solar eclipse occurs when the moon casts it shadow on Earth.
A lunar eclipse is an event that occurs when Earth casts its shadow on the moon.
A total eclipse is an eclipse that occurs when the three bodies are perfectly lined up.
partial eclipse occurs when Earth or the moon only partly enters the other's shadow.
An annular solar eclipse occurs when the moon is farther from Earth.
An ellipse is an oval shape with an equation having this form.
The degree to which an orbit's elliptical shape is flattened is called the eccentricity.
Orbital resonance is a situation in which there are integer ratios among the periods of
either revolutions only or of both revolutions and rotations of orbiting bodies.
Electric charge is a physical property of matter that causes it to experience an electric
force.
The SI unit for electric charge (q) is called the coulomb (C).

2. The magnitude of the electric force between two charged objects is represented
mathematically by Coulomb's law.
The constant of proportionality, ke, is called the Coulomb constant.
Triboelectric charging is a process in which an object becomes charged after coming in
direct contact with another object and then separating from it.
A triboelectric series is a list of materials ranked according to the tendency to gain or lose
electrons.
Electrostatic induction is the redistribution of electric charge in an object by the influence
of a nearby charge.
The point where the attractive electric force is balanced by the repulsive resistance to
overlapping electron clouds is called the constant distance.