Deprecated: htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in D:\ServerData\Apache24\httpdocs\_joomla\astronomicalheritage.net\libraries\src\Document\Renderer\Feed\AtomRenderer.php on line 89 UNESCO Portal to the Heritage of Astronomy - Webportal advisorshttps://web.astronomicalheritage.net/contacts/webportal-advisors2024-05-19T11:17:48+00:00UNESCO Portal to the Heritage of AstronomyJoomla! - Open Source Content ManagementAnna Sidorenko-Dulom2024-02-18T13:36:17+00:002024-02-18T13:36:17+00:00https://web.astronomicalheritage.net/contacts/webportal-advisors/anna-sidorenko-dulomRüdiger SchultzDominique Morisse2024-02-18T13:36:49+00:002024-02-18T13:36:49+00:00https://web.astronomicalheritage.net/contacts/webportal-advisors/dominique-morisseRüdiger SchultzMichel Cotte2024-02-18T13:37:14+00:002024-02-18T13:37:14+00:00https://web.astronomicalheritage.net/contacts/webportal-advisors/michel-cotteRüdiger Schultz