Is this flight software?

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

Pass predictor

Next visible pass over an observer location.

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

AOS: el↑mask · t_max @ ėl=0 · LOS: el↓mask

Visible pass timing

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.

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