Plane change at apoapsis

Compare pure plane-change Δv at periapsis vs apoapsis of an ellipse: why FDO waits for apo.

SIDUS educational calculator. Category orbital. Tags: delta-v, maneuver, mission-design, orbital. Pure SI. Not flight software.

Formula

Δv = 2 v sin(Δi/2) (cheaper at apo)

Plane change at peri vs apo

Primary sources

Fundamentals of Astrodynamics and Applications (David A. Vallado): Standard reference for two-body, Lambert, maneuvers, and J2. Equations implemented independently in SIDUS.
Orbital Mechanics for Engineering Students (Howard D. Curtis): Textbook derivations for Hohmann, vis-viva, rocket equation, elements.
AeroVia Aerospace Tools (AeroVia (public calculators)): Public catalog of ISA, dynamic pressure, launch azimuth, RF link, SSO-class tools (domain demand reference).

How do AI agents use this tool?

Read /llms.txt or call https://sidus.tools/api/mcp. Open the interactive page for live SI inputs.

Open interactive tool · SIDUS