Is this flight software?

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

Circularize burn

Δv to circularize an ellipse at periapsis or apoapsis.

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

Δv = |v_ell − v_c| at apsis

Circularize an elliptical orbit

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.