Sterrenhemel - gebruikte onderdelen en licenties
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De Sterrenhemel zelf is gemaakt voor codevibe.nl (by Denny Plaggenburg).

1. Astronomy Engine (astronomy.browser.min.js)
   Positie van zon, maan en planeten, sterrentijd, opkomst en ondergang.
   Auteur: Don Cross. Licentie: MIT. https://github.com/cosinekitty/astronomy
   De volledige licentietekst staat bovenaan het bestand astronomy.browser.min.js.

2. d3-celestial (sky-data.js: sterren, sterrenbeelden en Melkweg)
   De gegevens zijn samengesteld uit de gegevensbestanden van d3-celestial
   (https://github.com/ofrohn/d3-celestial) van Olaf Frohn en bewerkt:
   afgerond, samengevoegd en met Nederlandse namen van de sterrenbeelden.
   Onderliggende bron voor de sterren: de Hipparcos-catalogus (ESA).

   d3-celestial is uitgebracht onder de BSD 3-Clause-licentie:

   Copyright (c) 2015, Olaf Frohn
   All rights reserved.

   Redistribution and use in source and binary forms, with or without modification, are
   permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice, this list of
      conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright notice, this list of
      conditions and the following disclaimer in the documentation and/or other materials
      provided with the distribution.
   3. Neither the name of the copyright holder nor the names of its contributors may be used to
      endorse or promote products derived from this software without specific prior written
      permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   OF THE POSSIBILITY OF SUCH DAMAGE.