Before, horizontal coordinates were initialized with the latitude and
longitude angles of the observer.

Recently, `Astronoby::Observer` was introduced to encapsulate data and
behaviour from an observer, out of other unrelated objects.

Now, horizontal coordinates are initialized with an observer object.

There was no behaviour change.

 ## 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

### 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