File:Ancient Roman time keeping hora hora noctis.png
| Uploaded by | Darekk2 |
|---|---|
| Upload date | 2016-03-14T23:27:30Z |
| MIME type | image/png |
| Dimensions | 800 × 1183 px |
| File size | 275.9 KB |
Summary
| Description |
English: This is a diagram illustrating the Roman system of time keeping - division of the day into 12 segments (hours) called hora and the night into 12 segments (hours) called hora noctis (hora prima noctis, hora secunda noctis, hora tertia noctis etc). The surise and sunset times for this diagram are calculated for Forum Romanum 41°53′33″N 12°29′07″E / 41.892426°N 12.485167°E AD 8 (the Julian calendar). Many sources however are ambiguous because of confusing terms sunrise with dusk and sunset with dawn. This is important, because times of dusk and dawn differ significantly from times of sunrise and sunset. The semidiameter of the sun and atmospheric refraction are taken into account. Equinoxes and solstices are computed too, not set by Romans. |
| Date | |
| Source | Own work |
| Author | Darekk2 |
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