Is this flight software?

No. SIDUS models are educational reimplementations. Cross-check before any flight decision.

Synodic period

Relative period between two circular coplanar orbits (rendezvous geometry timing).

SIDUS educational calculator. Category orbital. Tags: mission-design, operations, orbital, rendezvous. Pure SI. Not flight software.

T_syn = 2π / |n₂ − n₁|

Relative period of two circular orbits

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.
Spaceflight Dynamics (William E. Wiesel): Relative motion, rendezvous, and phasing context complementary to Vallado/Curtis.

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