What day is admission free? And at what time?

It s free. 0$

Pay-what-you-wish General Admission is available at ticket counters inside the Museum, and gives access to 40+ permanent galleries, including the Rose Center for Earth and Space. For admission to special exhibitions, films, and the Space Show, a +One or +All ticket is required. These can be purchased in advance over the web, or in person at the Museum. https://ticketing.amnh.org/

You have to give a donation!!

Hi Catalina, the price is the will. Go to the ticket office and there they ask you how much you want to pay

Admission is $ 23