File:Ancient Roman time keeping hora vigilia duration.webm

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Ancient_Roman_time_keeping_hora_vigilia_duration.webm ‎(WebM audio/video file, VP9, length 3.4 s, 400 × 418 pixels, 910 kbps overall, file size: 379 KB)

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English: Distribution of horae and vigiliae for the year AD 8 - WEBM animation.

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 / 41.892426; 12.485167 AD 8 (the Julian calendar). Sunrise and sunset times are used as boundaries of day and night. 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.

Sunrise and sunset times were calculated using algorithms from:
Jean Meeus, Astronomical algorithms, Second English Edition, Willmann-Bell, Inc., Richmond, Virginia, 1998, With corrections as of August 10, 2009, ISBN 0-943396-61-1.
There is an online calculator also based on Astronomical Algorithms, by Jean Meeus, computing sunrise and sunset times, sun azimuths and elevations:
http://www.esrl.noaa.gov/gmd/grad/solcalc/ NOAA Solar Calculator
(Gregorian calendar)

however calculations for this image are based directly on this Meeus's book.
Date
Source File:Ancient Roman time keeping hora vigilia duration.gif
Author Darekk2

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Date/TimeThumbnailDimensionsUserComment
current21:13, 7 November 20213.4 s, 400 × 418 (379 KB)GrandEscogriffe (talk | contribs)there.
20:27, 7 November 20211.7 s, 400 × 418 (205 KB)GrandEscogriffe (talk | contribs)twice as long
19:58, 7 November 20211.7 s, 400 × 418 (205 KB)GrandEscogriffe (talk | contribs)Uploaded a work by Darekk2 from File:Ancient Roman time keeping hora vigilia duration.gif with UploadWizard

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Format Bitrate Download Status Encode time
VP9 360P 217 kbps Completed 21:13, 7 November 2021 5.0 s
Streaming 360p (VP9) 218 kbps Completed 07:23, 2 January 2024 1.0 s
VP9 240P 115 kbps Completed 21:13, 7 November 2021 5.0 s
Streaming 240p (VP9) 115 kbps Completed 03:30, 12 December 2023 1.0 s
WebM 360P 341 kbps Completed 21:13, 7 November 2021 1.0 s
Streaming 144p (MJPEG) 1.32 Mbps Completed 06:36, 30 October 2023 1.0 s

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