MOONWATCH

April’s top lunar feature to observe

Römer Type: Crater Size: 40km Longitude/latitude: 36.4° E, 25.4° N Age: Around 3.9 billion years Best time to see: Four days after first quarter (2 April) or three days after last quarter (16–17 April) Minimum equipment: 50mm telescope The crater Römer is named after Ole Rømer, the Danish astronomer who made the first measurements of the speed of light in 1676. It’s a distinctive 40km-diameter crater somewhat disguised by its heavily cratered surroundings, located in the highland region to the east of 650km Mare Serenitatis. It sits in a position roughly one-quarter of the way from the eastern edge of Serenitatis, marked by the circular bay formed by the flooded 61km crater Le Monnier and the northwestern edge of 620km x 570km Mare Crisium. The surrounding region is rough and pockmarked by other craters, those…

You're reading a preview of

BBC Sky at Night United Kingdom (Digital) - 1 Issue, April 2025

DiscountMags is a licensed distributor (not a publisher) of the above content and Publication through Zinio LLC. Accordingly, we have no editorial control over the Publications. Any opinions, advice, statements, services, offers or other information or content expressed or made available by third parties, including those made in Publications offered on our website, are those of the respective author(s) or publisher(s) and not of DiscountMags. DiscountMags does not guarantee the accuracy, completeness, truthfulness, or usefulness of all or any portion of any publication or any services or offers made by third parties, nor will we be liable for any loss or damage caused by your reliance on information contained in any Publication, or your use of services offered, or your acceptance of any offers made through the Service or the Publications. For content removal requests, please contact Zinio.