Add twilight times #49
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Due to the atmospheric refraction, the sky remains bright for some time before the sunset and after the sunrise. This brightness of the sky is called twilight and decreases proportionally to the Sun's angular distance below the observer's horizon. Between the day and the night, three different twilights are defined: * Civil twilight: when the Sun's between 0° and 6° below the horizon * Nautical twilight: when the Sun's between 6° and 12° below the horizon * Astronomical twilight: when the Sun's between 12° and 18° below the horizon This change introduces 6 new methods to `Astronoby::Sun` to provide the instant in time (UTC) of each of these twilight changes: * `#morning_civil_twilight_time`: when the morning civil twilight starts * `#evening_civil_twilight_time`: when the evening civil twilight ends * `#morning_nautical_twilight_time`: when the morning nautical twilight starts * `#evening_nautical_twilight_time`: when the evening nautical twilight ends * `#morning_astronomical_twilight_time`: when the night ends and the morning astronomical twilight starts * `#evening_astronomical_twilight_time`: when the evening astronomical twilight ends and the night starts On latitudes close to the poles, the night never completely falls for some days in the year. When this happens, these methods will return `nil` instead of a time.
rhannequin
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## What's Changed _If you are upgrading: please see [UPGRADING.md]._ [UPGRADING.md]: https://github.com/rhannequin/astronoby/blob/main/UPGRADING.md ### Bug fixes * Fix ecliptic to equatorial epoch ([#56]) [#56]: #56 ### Features * Add twilight times ([#49]) * Add interpolation method ([#52]) * Add decimal_hour_to_time util ([#53]) * Calculate leap seconds for an instant ([#54]) * Add `Angle#-@` ([#55]) * Enable equivalence and hash equality to `Observer` ([#57]) * Twilight events dedicated class ([#61]) [#49]: #49 [#52]: #52 [#53]: #53 [#54]: #54 [#55]: #55 [#57]: #57 [#61]: #61 ### Improvements * Upgrade bundler from 2.3.11 to 2.5.7 by @dorianmariecom ([#45]) * Drop `BigDecimal` ([#46]) * Bump rake from 13.1.0 to 13.2.0 ([#47]) * Increase Ruby versions support ([#48]) * Bump rake from 13.2.0 to 13.2.1 ([#51]) * Dedicated constants class ([#62]) * Improve accuracy of equation of time ([#63]) * Twilight times better accuracy ([#65]) * Update UPGRADING.md ([#66]) * release: Bump version to 0.4.0 ([#67]) [#45]: #45 [#46]: #46 [#47]: #47 [#48]: #48 [#51]: #51 [#62]: #62 [#63]: #63 [#65]: #65 [#66]: #66 [#67]: #67 ### Backward-incompatible changes * More accurate rising, transit and setting times ([#50]) * Observation events dedicated and centralized class ([#60]) * Change `Astronoby::Sun` constructor ([#64]) [#50]: #50 [#60]: #60 [#64]: #64 ## New Contributors * @dorianmariecom made their first contribution in [#45] [#45]: #45 **Full Changelog**: v0.3.0...v0.4.0
rhannequin
added a commit
that referenced
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Apr 29, 2024
## What's Changed _If you are upgrading: please see [UPGRADING.md]._ [UPGRADING.md]: https://github.com/rhannequin/astronoby/blob/main/UPGRADING.md ### Bug fixes * Fix ecliptic to equatorial epoch ([#56]) [#56]: #56 ### Features * Add twilight times ([#49]) * Add interpolation method ([#52]) * Add decimal_hour_to_time util ([#53]) * Calculate leap seconds for an instant ([#54]) * Add `Angle#-@` ([#55]) * Enable equivalence and hash equality to `Observer` ([#57]) * Twilight events dedicated class ([#61]) [#49]: #49 [#52]: #52 [#53]: #53 [#54]: #54 [#55]: #55 [#57]: #57 [#61]: #61 ### Improvements * Upgrade bundler from 2.3.11 to 2.5.7 by @dorianmariecom ([#45]) * Drop `BigDecimal` ([#46]) * Bump rake from 13.1.0 to 13.2.0 ([#47]) * Increase Ruby versions support ([#48]) * Bump rake from 13.2.0 to 13.2.1 ([#51]) * Dedicated constants class ([#62]) * Improve accuracy of equation of time ([#63]) * Twilight times better accuracy ([#65]) * Update UPGRADING.md ([#66]) * release: Bump version to 0.4.0 ([#67]) [#45]: #45 [#46]: #46 [#47]: #47 [#48]: #48 [#51]: #51 [#62]: #62 [#63]: #63 [#65]: #65 [#66]: #66 [#67]: #67 ### Backward-incompatible changes * More accurate rising, transit and setting times ([#50]) * Observation events dedicated and centralized class ([#60]) * Change `Astronoby::Sun` constructor ([#64]) [#50]: #50 [#60]: #60 [#64]: #64 ## New Contributors * @dorianmariecom made their first contribution in [#45] [#45]: #45 **Full Changelog**: v0.3.0...v0.4.0
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Due to the atmospheric refraction, the sky remains bright for some time before the sunset and after the sunrise. This brightness of the sky is called twilight and decreases proportionally to the Sun's angular distance below the observer's horizon.
Between the day and the night, three different twilights are defined:
Source: @timeanddate.com
This change introduces 6 new methods to
Astronoby::Sunto provide the instant in time (UTC) of each of these twilight changes:#morning_civil_twilight_time: when the morning civil twilight starts#evening_civil_twilight_time: when the evening civil twilight ends#morning_nautical_twilight_time: when the morning nautical twilight starts#evening_nautical_twilight_time: when the evening nautical twilight ends#morning_astronomical_twilight_time: when the night ends and the morning astronomical twilight starts#evening_astronomical_twilight_time: when the evening astronomical twilight ends and the night starts