Moon's phase angle and illuminated fraction#80
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rhannequin merged 1 commit intomainfrom May 31, 2024
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rhannequin
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## 0.5.0 - 2024-06-11 _If you are upgrading: please see [UPGRADING.md]._ [UPGRADING.md]: https://github.com/rhannequin/astronoby/blob/main/UPGRADING.md ### Features * Make `Sun#mean_anomaly` public ([#72]) * Moon ecliptic coordinates ([#73]) * Moon apparent geocentric equatorial coordinates ([#75]) * Moon horizontal coordinates ([#76]) * Assume Moon's equatorial coordinates are geocentric ([#77]) * Use observer object for geocentric parallax ([#79]) * Moon's phase angle and illuminated fraction ([#80]) * Monthly Moon phases ([#82]) * Rationalize negative degree angles ([#83]) * Factorize Moon phases periodic terms ([#85]) * Introduce observation events for Moon ([#86]) [#72]: #72 [#73]: #73 [#75]: #75 [#76]: #76 [#77]: #77 [#79]: #79 [#80]: #80 [#82]: #82 [#83]: #83 [#85]: #85 [#86]: #86 ### Improvements * Create FUNDING.yml ([#70]) * Bump standard from 1.35.1 to 1.36.0 ([#71]) * Bump rexml from 3.2.6 to 3.2.8 ([#74]) * Expand the number of tested Ruby versions ([#84]) * Add Ruby 3.1.6 and 3.3.2 coverage ([#88]) * Improve and update documentation ([#87]) * Update UPGRADING.md ([#89]) [#70]: #70 [#71]: #71 [#74]: #74 [#84]: #84 [#88]: #88 [#87]: #87 [#89]: #89 ### Backward-incompatible changes * Use Observer in Horizontal coordinates ([#69]) * Introduce `Astronoby::Distance` value object ([#78]) [#69]: #69 [#78]: #78 **Full Changelog**: v0.4.0...v0.5.0
rhannequin
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### Features * Make `Sun#mean_anomaly` public ([#72]) * Moon ecliptic coordinates ([#73]) * Moon apparent geocentric equatorial coordinates ([#75]) * Moon horizontal coordinates ([#76]) * Assume Moon's equatorial coordinates are geocentric ([#77]) * Use observer object for geocentric parallax ([#79]) * Moon's phase angle and illuminated fraction ([#80]) * Monthly Moon phases ([#82]) * Rationalize negative degree angles ([#83]) * Factorize Moon phases periodic terms ([#85]) * Introduce observation events for Moon ([#86]) [#72]: #72 [#73]: #73 [#75]: #75 [#76]: #76 [#77]: #77 [#79]: #79 [#80]: #80 [#82]: #82 [#83]: #83 [#85]: #85 [#86]: #86 ### Improvements * Create FUNDING.yml ([#70]) * Bump standard from 1.35.1 to 1.36.0 ([#71]) * Bump rexml from 3.2.6 to 3.2.8 ([#74]) * Expand the number of tested Ruby versions ([#84]) * Add Ruby 3.1.6 and 3.3.2 coverage ([#88]) * Improve and update documentation ([#87]) * Update UPGRADING.md ([#89]) [#70]: #70 [#71]: #71 [#74]: #74 [#84]: #84 [#88]: #88 [#87]: #87 [#89]: #89 ### Backward-incompatible changes * Use Observer in Horizontal coordinates ([#69]) * Introduce `Astronoby::Distance` value object ([#78]) [#69]: #69 [#78]: #78 **Full Changelog**: v0.4.0...v0.5.0
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This introduces two new Moon-related information: the phase angle and the illuminated fraction.
The phase angle is the angle between the incident light from the Sun onto the Moon and the reflected light from the Moon.
The illuminated fraction is the ratio of illuminated Moon surface as seen from the Earth. Multiplied by 100, it gives the percentage of illuminated surface as seen from the Earth.