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Project description

Sundowner is a Python3 Flask application that provides an API to return JSON objects containing Javascript timestamps of civil dawn, civil dusk, sunrise, and sunset.

It also provides a simple web app that uses this API.

Sundowner uses PyEphem to calculate astronomical parameters.

Sunrise and sunset times are calculated according to the United States Naval Observatory specifications, whereby for dawn and dusk, atmospheric refraction is estimated by setting observer pressure to zero and the horizon to 34 arcminutes below the normal horizon.

Civil dawn and dusk are when the sun is 6º below the horizon.

Sundowner is licensed under the MIT License.


Sundowner has the following Python3 dependencies:

  • Flask 0.10
  • ephem 3.7
  • itsdangerous 0.24
  • Jinja2 2.7.2
  • MarkupSafe 0.23
  • Werkzeug 0.9.4
  • python-dateutil 2.2

URL endpoints

Sundowner exposes the following endpoint:

  • /api/sun


  • <lat> and <lon> are simple decimals of latitude and longitude respectively, e.g. Rothera’s location is expressed as -67.57 and -68.13
  • <start> and <end> are start and end dates for the desired period, in ISO 8601 format (as produced by Javascript’s .toJSON() method)
  • <output_type> is an optional parameter for the resulting datetimes, defaulting to iso for ISO 8601 format. Alternatively, use js for Javascript timestamp, or dt for a human-readable datetime.


The API returns a JSON object, as follows:

  "days": [
      "date": "2014-05-23",
      "events": {
        "civil_dawn": "2014-05-23T12:58:31.819853+00:00",
        "civil_dusk": "2014-05-23T19:59:14.923174+00:00",
        "sunrise": "2014-05-23T14:31:56.000752+00:00",
        "sunset": "2014-05-23T18:25:53.468033+00:00"
  "latlon": {
    "lat": "-67.57",
    "lon": "-68.13"


Sundowner uses the following components:

Full-text copies of the above licenses may be found at:

Project details

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Files for Sundowner, version 0.2
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