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This introduces `Astronoby::Nutation2`, temporarily named this way, as the new nutation model for Astronoby. The astronomical nutation is a phenomenon which causes the orientation of the axis of rotation of a spinning astronomical object to vary over time. It contributes to about 2% of the total precession, the long-period rotation of the Earth's rotation axis. `Astronoby::Nutation2` relies on official terms from the IAU 2000B model, which is a simplified but still extremely accurate version of the IAU 2000A model. IAU2000B contains the 77 most significant terms from the 1365 terms from IAU2000A, while it only sacrifices 1 milliarcsecond of accuracy throughout 1995-2025. The matrix product of the precession matrix and the nutation matrix accounts for the total precession effect. This is necessary to compute the apparent position of a celestial object as seen from an observer on Earth.
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## 0.7.0 - 2025-05-12 _If you are upgrading: please see [UPGRADING.md]._ ### Bug fixes * Fix Moon monthly phase events calculation by @valeriy-sokoloff in ([#124]) ### Features * Add `Instant` value object ([#121]) * Introduce barycentric position of Solar System major bodies ([#127]) * Introduce Astrometric position for planets ([#129]) * Rename Barycentric into Geometric ([#130]) * Rename IRCF and remove module Position ([#131]) * Geometric and Astrometric reference frames with coordinates ([#132]) * Ecliptic coordinates for Geometric and Astrometric reference frames ([#134]) * Add Geometric and Astrometric positions for `Sun` and `Moon` ([#135]) * Implement new aberration correction ([#136]) * Precession matrix for 2006 P03 model ([#137]) * Introduce `MeanOfDate` reference frame ([#138]) * New nutation model ([#141]) * Light deflection correction ([#142]) * Introduce `Apparent` reference frame ([#143]) * Introduce `Topocentric` reference frame ([#145]) * Improve Vector integration with value objects ([#146]) * Handle refracted topocentric horizontal coordinates ([#147]) * Add `#angular_diameter` to apparent and topocentric reference frames ([#149]) * Introduce new calculator for rising, transit and setting times ([#148]) * Clean code after Ephem refactoring ([#152]) * Improve `RisingTransitSettingEventsCalculator` ([#155]) * Simplify `RisingTransitSettingEventsCalculator` ([#156]) * Lazy-load reference frames ([#157]) * Overall performance improvements ([#163]) * Add support for IMCCE INPOP by @JoelQ and @rhannequin ([#166]) * Update INPOP excerpt in spec data ([#167]) * Introduce a better rise/transit/set calculator ([#168]) * Drop `Astronoby::Observer#observe` ([#174]) ### Improvements * Bump standard from 1.42.1 to 1.49.0 by @dependabot ([#123], [#128], [#150], [#165]) * Bump rubyzip from 2.3.2 to 2.4.1 by @dependabot ([#120]) * Add more tests for Julian Date conversion ([#122]) * Upgrade main Ruby version and supported ones ([#125]) * Update email address and gem description ([#126]) * Increase precision of mean obliquity ([#133]) * Add supported Rubies ([#139]) * Set Ruby 3.4.2 as default version ([#140]) * Fix dependency secutiry patch ([#151]) * Improve HMS/DMS formats ([#153]) * Use excerpts ephemerides for specs of Sun and Moon ([#154]) * Add link to deprecated documentation ([#160]) * Default Ruby 3.4.3 and support recent rubies ([#169]) * Better Moon phases test coverage ([#172]) * Optimize Observer with GMST from Instant ([#173]) * Update README about documentation location ([#175]) * Add GitHub Actions permissions ([#176]) ### New Contributors * @valeriy-sokoloff made their first contribution in #124 * @JoelQ made their first contribution in #166 **Full Changelog**: v0.6.0...v0.7.0 [#120]: #120 [#121]: #121 [#122]: #122 [#123]: #123 [#124]: #124 [#125]: #125 [#126]: #126 [#127]: #127 [#128]: #128 [#129]: #129 [#130]: #130 [#131]: #131 [#132]: #132 [#133]: #133 [#134]: #134 [#135]: #135 [#136]: #136 [#137]: #137 [#138]: #138 [#139]: #139 [#140]: #140 [#141]: #141 [#142]: #142 [#143]: #143 [#145]: #145 [#146]: #146 [#147]: #147 [#148]: #148 [#149]: #149 [#150]: #150 [#151]: #151 [#152]: #152 [#153]: #153 [#154]: #154 [#155]: #155 [#156]: #156 [#157]: #157 [#160]: #160 [#163]: #163 [#165]: #165 [#166]: #166 [#167]: #167 [#168]: #168 [#169]: #169 [#172]: #172 [#173]: #173 [#174]: #174 [#175]: #175 [#176]: #176 [UPGRADING.md]: https://github.com/rhannequin/astronoby/blob/main/UPGRADING.md
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This introduces
Astronoby::Nutation2, temporarily named this way, as the new nutation model for Astronoby.The astronomical nutation is a phenomenon which causes the orientation of the axis of rotation of a spinning astronomical object to vary over time.
It contributes to about 2% of the total precession, the long-period rotation of the Earth's rotation axis.
Astronoby::Nutation2relies on official terms from the IAU 2000B model, which is a simplified but still extremely accurate version of the IAU 2000A model.IAU2000B contains the 77 most significant terms from the 1365 terms from IAU2000A, while it only sacrifices 1 milliarcsecond of accuracy throughout 1995-2025.
The matrix product of the precession matrix and the nutation matrix accounts for the total precession effect. This is necessary to compute the apparent position of a celestial object as seen from an observer on Earth.