Museums with astronomical and/or timekeeping objects in their collections (not all are on public display - check before you make a journey!):
Egyptian Museum, Cairo, Egypt: https://egyptianmuseumcairo.eg/
National Museum of Egyptian Civilization (NMEC): https://nmec.gov.eg/
British Museum, London, UK: http://www.britishmuseum.org/
Egyptian Museum, Turin, Italy: http://www.museoegizio.it/
Roemer- und Pelizaeus-Museum, Hildesheim, Germany: http://www.rpmuseum.de/
Castle Museum Hohentübingen, Tübingen, Germany: https://www.unimuseum.uni-tuebingen.de/de/sammlungen/aegyptische-sammlung
Musée du Louvre, Paris, France: http://www.louvre.fr/
Ägyptisches Museum, Berlin https://www.smb.museum/en/museums-institutions/aegyptisches-museum-und-papyrussammlung/home/
Los Angeles County Museum of Art (LACMA): http://www.lacma.org/
Societies:
The Egypt Exploration Society: http://www.ees.ac.uk/
The Society for the Study of Egyptian Antiquities: https://sseatoronto.wordpress.com/
The American Research Centre in Egypt: http://www.arce.org/
The International Association of Egyptologists: http://iae-egyptology.org/