Is this flight software?

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

SGP4 / TLE propagate

Propagate NORAD TLE with SGP4/SDP4 (via satellite.js, MIT).

SIDUS educational calculator. Category satellite. Tags: operations, satellite, trajectory. Pure SI. Not flight software.

TLE → r_TEME(t), v_TEME(t) · SGP4/SDP4

NORAD element set propagation

satellite.js (MIT License): Browser SGP4/SDP4 propagation library used by SIDUS satellite tools.
CelesTrak (CelesTrak): TLE sets, NORAD element documentation, and Vallado software companion hosting.
Fundamentals of Astrodynamics and Applications (David A. Vallado): Standard reference for two-body, Lambert, maneuvers, and J2. Equations implemented independently in SIDUS.
Space-Track / USSF catalog practice (18th SDS / Space-Track.org): Operational TLE distribution context (account required for live data). SIDUS uses public educational TLE samples only.

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