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Rustaman
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Analisis Periode Rotasi Matahari Berdasarkan Pergerakan Bintik Matahari AR 4207 pada Citra SolarHam Tanggal 1–8 September 2025 Rustaman; Utama, Rodika
JURNAL ARMADA PENDIDIKAN Vol 4 No 1 (2026): JURNAL ARMADA PENDIDIKAN
Publisher : Kilau Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60041/jap.v4i1.333

Abstract

This study aims to determine the rotational period of the Sun by analyzing the motion of a sunspot across the solar disk. The active sunspot region AR 4207 was examined using solar continuum images acquired on 1 and 8 September 2025. The position of the sunspot on each date was projected onto a circular diagram with the central meridian as the reference axis in order to measure its angular displacement. The projected angles relative to the central meridian were found to be  on 1 September and  on 8 September, yielding a total displacement of  over a seven-day interval. By applying the relation , the solar rotation period was calculated to be  days. This result aligns with the typical synodic rotation period of the Sun at low latitudes. The findings demonstrate that sunspot tracking provides a simple and effective method for estimating the Sun’s rotation, making it well suited for educational and observational activities in astronomy.
The Action Scale and The Emergence of Classical Dynamics in Quantum Systems Utama, Rodika; Rustaman
JURNAL ARMADA PENDIDIKAN Vol 4 No 2 (2026): JURNAL ARMADA PENDIDIKAN
Publisher : Kilau Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60041/jap.v4i2.370

Abstract

The principle of action plays a central role in both classical and quantum mechanics, yet its physical meaning is often introduced in a purely formal manner. In this work, the concept of action is examined from a scale-based perspective that clarifies its role in the quantum–classical correspondence. By emphasizing the dimensionless ratio S/ℏ, we show that the emergence of classical dynamics can be understood as a consequence of quantum phase coherence rather than as an independent postulate. Within the path integral formulation, classical trajectories arise naturally from stationary-phase conditions when the action associated with a physical process becomes large compared to Planck’s constant. This interpretation provides a unified conceptual framework in which variational principles, quantum interference, and classical determinism are linked through the scale of action. The analysis highlights the role of Planck’s constant as a universal parameter governing the physical relevance of alternative histories, analogous to the function of Boltzmann’s constant in statistical physics. Beyond its theoretical implications, the proposed perspective offers pedagogical value by providing a coherent bridge between classical and quantum mechanics suitable for advanced undergraduate and early graduate physics education.
Co-Authors Utama, Rodika