A common beat, a shared reference
How might distant observers put their histories on a shared calendar? Stardate SIML explores three ingredients: a hydrogen-reference counting unit, an explicitly declared coordinate frame, and a documented calendar zero. Open the interactive Stardate explorer to rewind the reference, compare two observers and inspect the frozen research results.
The concept distinguishes an operational calendar from an uncertain physical history. A stable calendar can keep its original timestamps while improved research changes how those timestamps map to a black hole’s past.
Choose a zero; keep the assumptions
The interactive illustration rewinds a stipulated energy account for Sagittarius A*. Its remaining fraction controls the shrinking artistic image. When that account reaches exactly zero, it defines the proposed calendar origin.
This is a chosen convention, not a measurement of when Sagittarius A formed*. The frozen power assumption is synthetic, the polar streams are illustrative, and the animation is not a physical reconstruction of the black hole’s growth. Hydrogen-reference units supply a duration, not a complete coordinate frame or a universal clock realization.
Two observers, one event
Each observer records a local clock reading. Comparing their dates requires clock calibration, motion and gravity corrections, signal travel time, and the same versioned frame and epoch. The explorer shows these differences using synthetic observer records and exact integer-and-rational hydrogen-cycle timestamps.
What the experiments test
The research explorer loads persisted results from synthetic models; its selectors do not fit a new history in the browser. Growth-history comparisons illustrate how the same present mass can be compatible with different pasts. Evidence, priors and model assumptions affect the inferred age intervals, while shared-epoch experiments examine when a common date can be recovered.
The present implementation uses a radial Schwarzschild experiment. It does not establish an adopted galactic standard or physical dating accuracy for Sagittarius A*. Published mass summaries are labeled separately from the synthetic astronomical records and do not supply a measured lifetime growth history.
Methods and release status
The explorer includes the versioned convention, frozen result downloads, provenance and a captioned visual introduction. All astronomical experiment records shown here are synthetic. The pre-release paper is available through View Paper above; it is not peer reviewed. The open-source repository contains the code and methods for closer examination.