SolsticeHub

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Home Assistant integration for sun-based calendars: astronomical seasons, the Celtic Wheel of the Year, and Chinese solar terms — with timestamps, countdowns and daylight-trend tracking.

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# SolsticeHub

> A Home Assistant integration for sun-based calendar systems: precise
> astronomical seasons, the Celtic Wheel of the Year, and the Chinese solar
> terms — with exact timestamps, countdowns and daylight-trend tracking.

[![GitHub Release](https://img.shields.io/github/v/release/moerk-o/SolsticeHub?style=flat-square)](https://github.com/moerk-o/SolsticeHub/releases)
[![HACS](https://img.shields.io/badge/HACS-Default-41BDF5.svg?style=flat-square)](https://github.com/hacs/integration)
[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg?style=flat-square)](https://opensource.org/licenses/MIT)
[![Home Assistant](https://img.shields.io/badge/Home%20Assistant-Custom%20Integration-41bdf5?style=flat-square&logo=homeassistant)](https://www.home-assistant.io/)

> **Upgrading from "Solstice Season" (v1.x)?** SolsticeHub is the renamed
> successor. The domain changed, so a manual migration is required — see
> [Migrating from Solstice Season](#migrating-from-solstice-season).

## What it does

Home Assistant's built-in [Season integration](https://www.home-assistant.io/integrations/season/)
provides only the current astronomical/meteorological season. SolsticeHub adds
detail and more calendar systems, all calculated locally with
[PyEphem](https://rhodesmill.org/pyephem/) — no internet connection required.

When you add the integration you pick a **device type**. Each instance creates
one device with its own sensors; you can add several (e.g. one Four Seasons and
one Chinese Solar Terms device).

| Device type | What you get |
|-------------|--------------|
| **Four Seasons** | Current season + timestamps for each equinox/solstice + next season change |
| **Cross-Quarter / Celtic** | The Wheel of the Year (Imbolc, Ostara, Beltane, Litha, Lughnasadh, Mabon, Samhain, Yule) |
| **Chinese Solar Terms** | The 24 solar terms (or the 8 major ones) |

Every device additionally exposes the **shared sun-data sensors**: a daylight
trend (are the days getting longer or shorter?), the timestamp of the next
trend change (the next solstice), and a diagnostic solar-longitude sensor
(disabled by default).

## Installation

### HACS (recommended)

[![Open your Home Assistant instance and open a repository inside the Home Assistant Community Store.](https://my.home-assistant.io/badges/hacs_repository.svg)](https://my.home-assistant.io/redirect/hacs_repository/?owner=moerk-o&repository=SolsticeHub)

1. Click the button above, or search for **SolsticeHub** in HACS
2. Install the integration and restart Home Assistant
3. Go to **Settings → Devices & Services → Add Integration**
4. Search for **SolsticeHub** and follow the setup wizard

### Manual

1. Download the latest release from [GitHub Releases](https://github.com/moerk-o/SolsticeHub/releases)
2. Copy `custom_components/solsticehub` into your `config/custom_components/` directory
3. Restart Home Assistant and add the integration via the UI

## Configuration

Configuration is done entirely through the UI. Step 1 asks for the device type;
step 2 collects type-specific options. You name the device (and assign an area)
in Home Assistant's standard final step.

| Device type | Options |
|-------------|---------|
| Four Seasons | Hemisphere (auto-filled from your Home location), Mode (astronomical / meteorological) |
| Cross-Quarter | Mode (astronomical midpoints / traditional fixed dates), Naming (system language / Celtic) |
| Chinese Solar Terms | Scope (all 24 / 8 major), Naming (system language / Pinyin / Hanzi) |

### Calculation modes (Four Seasons)

- **Astronomical** – seasons begin at the exact equinoxes and solstices (dates
  shift slightly each year). Calculated with PyEphem.
- **Meteorological** – seasons begin on fixed calendar dates (Mar/Jun/Sep/Dec
  1st, offset by six months in the southern hemisphere).

Hemisphere mapping is handled automatically. For the full reasoning and the
hemisphere/daylight-trend details, see [TECHNICAL_REFERENCE.md](TECHNICAL_REFERENCE.md).

## Entities

### Shared sun-data sensors (on every device)

These three sensors describe the sun itself, independent of any calendar, so
**every device you add includes its own copy** — whether it's a Four Seasons,
Cross-Quarter or Chinese device. That way a single device gives you both the
calendar *and* "is the day getting longer", with no extra setup.

I deliberately chose to let these sensors appear more than once if you add
several devices, because it's a simpler and — in my view — more user-friendly
approach than introducing a separate device just for them or applying other
"tricks". If it bothers you, the duplicates are harmless and you can disable the
extra ones per entity. I'm always open to suggestions for improvement.

| Entity | Type | Description |
|--------|------|-------------|
| `daylight_trend` | enum | `days_getting_longer` / `days_getting_shorter` / `solstice_today` |
| `next_daylight_trend_change` | timestamp | The next solstice (turning point of the trend) |
| `solar_longitude` | measurement (°) | Ecliptic longitude of the Sun (diagnostic, disabled by default) |

### Four Seasons

| Entity | Type | Notable attributes |
|--------|------|--------------------|
| `current_season` | enum (`spring`/`summer`/`autumn`/`winter`) | `mode`, `hemisphere`, `season_age`, `season_progress` |
| `spring_equinox`, `summer_solstice`, `autumn_equinox`, `winter_solstice` | timestamp | `days_until`, `last_start` |
| `next_season_change` | timestamp | `days_until`, `event_type` |

### Cross-Quarter / Celtic

| Entity | Type | Notable attributes |
|--------|------|--------------------|
| `current_period` | enum (the eight festivals) | `mode`, `period_age`, `events` |
| `next_period_change` | timestamp | `days_until`, `event_type` |

### Chinese Solar Terms

| Entity | Type | Notable attributes |
|--------|------|--------------------|
| `current_term` | enum (24 or 8 terms) | `scope`, `term_age`, `events` |
| `next_term_change` | timestamp | `days_until`, `event_type` |

All timestamps are stored in UTC; Home Assistant displays them in your local
timezone.

## Migrating from Solstice Season

SolsticeHub is the renamed successor of the *Solstice Season* integration. The
Home Assistant domain changed from `solstice_season` to `solsticehub`, so Home
Assistant treats it as a new integration and cannot migrate your configuration
automatically. A one-time manual switch is required:

1. *(Optional)* Note your current device type and options, and which automations
   or dashboards use the old entities.
2. Update to v2.0.0 (HACS shows it as an update of the same repository).
3. Remove the old **Solstice Season** integration: Settings → Devices & Services
   → *Solstice Season* → ⋮ → Delete.
4. Restart Home Assistant.
5. Add **SolsticeHub**: Settings → Devices & Services → *Add Integration* →
   *SolsticeHub*, then choose your device type and options.
6. Repoint your automations and dashboards to the new entities.

Your old entities' long-term statistics / history are not carried over. The
previous v1.x behaviour corresponds to the **Four Seasons** device type.

## Localization

Sensor display names and states are translated via Home Assistant's translation
system, following your user language. Currently supported: English (fallback),
German, Dutch. The default device name suggested on setup follows your Home
Assistant **system** language.

**Entity IDs are always English** (e.g. `sensor.four_seasons_astronomical_current_season`),
regardless of the language — so automations and dashboards keep working if you
change the language.

## Documentation

- Technical reference: [TECHNICAL_REFERENCE.md](TECHNICAL_REFERENCE.md)
- Release history: [RELEASENOTES.md](RELEASENOTES.md) (v1.x: [RELEASENOTES_v1.md](RELEASENOTES_v1.md))

## License

MIT — see [LICENSE](LICENSE).

## Acknowledgments

- Inspired by the [Home Assistant Season integration](https://www.home-assistant.io/integrations/season/)
- Astronomical calculations powered by [PyEphem](https://rhodesmill.org/pyephem/)

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