Dresden 2026 – wissenschaftliches Programm

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DD: Fachverband Didaktik der Physik

DD 5: Astronomie, Inklusion und Lernforschung

DD 5.2: Vortrag

Montag, 9. März 2026, 11:05–11:25, SCH/A284

Discoveries about the physics of space flight and time travel — •Hans-Otto Carmesin — Gymn. Athenaeum, Harsefelder Str. 40, 21680 Stade — Studienseminar Stade, Bahnhofstr. 5, 21682 Stade — Universität Bremen, Fachbereich 1, Pf 330440, 28334 Bremen

At the GPS, we realize the importance of synchronized clocks for navigation. Hereby, relativistic time dilation is essential: The context Laser-Ranging leads to the kinematic time dilation. The gravitative time dilation is discovered at the context free fall tower. The twin paradox is stimulating: One twin remains at Earth, the other travels through space. If the adequate coordinate system (ACS), that describes nature adequately, could be chosen freely, each of the twins could say that he is aging slower. Thus, we need the ACS. For it, already Foucault*s pendulum determined the angular frequency of the ACS: 360^∘ per day relative to Earth. Also in Newton*s mechanics, the ACS is determined: It is the inertial system, as Newton*s laws hold in this coordinate system. An empirical solution of the twin paradox is derived from measurements of the D1-mission in Earth*s orbit. The traveling twin ages slower. An institutional partial solution has been proposed by the International Astronomical Union (IAU): In space flight near Earth, a geocentric coordinate system is recommended. As a consequence, the present * day relativity theory is incomplete, as it does not provide an ACS, instead, it proclaims that all coordinate systems should be equivalent for the description of nature. I derive a complete solution that provides an ACS for each point in the universe. I report about experiences from teaching.

Keywords: Relativity; Gravity; Navigation