Minerva listened to a few answers and then put up her hand. "Well professor I think they can still be useful, but I think astronomers, wizards, or anyone else using them need to use everything they can. Alyssa mention the sun will never go away, but when using that instrument what happens if it is a cloudy or rainy day? There is no sun to place a shadow. So I feel it can be an accurate and a reliable way to measure time when the sun is around, but we need to have other ways when the sun is not out." she hoped she was making sense with her answer.