RAAN Drift
Estimate secular RAAN drift caused by Earth's J2 oblateness. This is useful for understanding sun-synchronous orbit design, nodal regression, and why inclination controls the sign of precession.
Nodal precession
The node line is where the orbit plane crosses the equator; J2 precession rotates that line over time.
The tilted orbital plane rotates about Earth
eastward 0.9632 deg/day
Inclination
98.00 deg
Altitude
700 km
Annual node motion
351.79 deg/yr
Orbit period
98.77 min
RAAN rate
0.96317 deg/day
1.9457e-7 rad/s
Orbital period
98.77 min
Mean two-body period
Semi-major axis
7,078.1 km
Earth radius plus altitude
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This tool is open source and the underlying logic is fully transparent. You can inspect the code, understand the calculations, and contribute improvements. If you want to use the tool in your own website, course page, or learning platform, you can also embed it directly and start from a ready-made iframe setup for this exact tool.
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