One phase fixes frequency and direction
Transforming a plane wave’s phase yields both the frequency ratio and aberration. At 0.6c a collinear ray has frequency ratio one half; a ray transverse in the original frame instead has ratio 1.25.
Read · Special relativity: from clock operations to electrodynamics · Results
§7 · Doppler shift and aberration
Follow the introduction and all ten sections, including field transformations, finite light complexes, moving mirrors, charge-current transformations, and the electron-force conventions.
Newly authored explanatory preview in modern notation, with editorial and physics review pending. Both the kinematic and electrodynamic halves are treated, but this is not a German transcription, an aligned translation, or a complete critical edition. The source paragraphs, footnotes, acknowledgment, and date-lines are not claimed to be fully represented or reviewed here. Headings and argument units are editorial.