# data[].attributes.body
A closed path around which a satellite travels, ellipses.

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- Two describe size and shape of the orbit
- Three decades the orientation of the orbit in space
- One describes the location of the satellite within the orbit
- Plus a Time Stamp

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- Describes the roundness
- A semi-major axis - long side
- B - semi-minor axis - short side
- When e=0, orbit is circular
- When e approaches 1, orbit is highly elliptical
- All closed orbits are 0=<e<1, reoccurring
- e is always between 0 and 1 for a closed orbit
- When e = 1 parabola
- When e > 1 hyperbola, a passing trajectory

# data[].attributes.headline
Semi-Major Axis (a) - SIZE and Period (T)

# data[].attributes.subject
Semi-Major Axis (a) - SIZE and Period (T)

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- Describes the size of the ellipse
- Half of the largest diameter
- Originate from the center, not necessarily where the central body is
- Apogee - orbit point farthest from the central body (Earth)
- Perigee - orbit point closest to the central body (Earth)
- In a circle apogee and perigee are the same so both are undefined
- Radius of Earth = 6,378 km
- Universal Gravitational Constant = G = 6.67x10^-11 m^3/kg*s^2
- Mass of Central Body (Earth) = M = 5.98x10^24 kg
- ONLY parameter that determines period (T) in seconds

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- Angle between the Earth's equatorial plane and the plane of the orbit
- Describes the tilt (PITCH)
- Measured in degrees
- Height of the inclination is the height of the ground trace
- i = 0 degrees is called equatorial orbit
- i = 90 degrees is called polar orbit

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- Given ground trace, period, and inclination can be found
- Top or bottom degree = inclination
- the trace gap = way to determine orbital period
- 4 minutes per degree
- Gap degrees*4 = period (T)

# data[].attributes.headline
Right Ascension of the Ascending Node (Omega) - Twist or Yaw 

# data[].attributes.subject
Right Ascension of the Ascending Node (Omega) - Twist or Yaw 

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- RAAN or Omega
- The rotation or twist about the earth (yaw)
- Angle is measured along the equatorial point in space (Vernal Equinox) and the point where the motion is from south to north across the equator (ascending node)
- Measured in degrees
- Ascending from south to north (up)
- Omega = 0 when ascending no0de is aligned with the vernal equinox

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- Describes the orientation of the apogee and the perigee (roll)
- Angle from the ascending node to the perigee point
- Measured in degrees 0 < w < 359
- Only exists if perigee exists

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- Once the orbit is completely described, satellites location on that orbit measured in degrees
- Perigee = 0 degrees
- Apogee = 180 degrees
- Measured in the direction the satellite moves

# data[].attributes.body
- Describes WHEN the set of values was accurate for the satellite (snapshot)

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Law 1 - Satellites travel around Earth in an elliptical path, Earth at a Foci
Law 2 - The line sweep from Earth to a satellite will be equal areas during equal
time periods anywhere on the orbital path.
- At apogee the satellite is moving the slowest
- At perigee the satellite is moving the fastest
Law 3 - Orbital period (T) is related to its semi-major axis