After reading the many tributes to Neil Armstrong, I remembered looking at the Apollo photographs on display at the Hayden Planetarium, American Museum of Natural History, New York. The next time I look at the Moon through the eyepiece of my scope, and if the phase is favourable, I will be sure to check out the Sea of Tranquility and consider the relative permanence of Neil Armstrong's boot print etched in Moon-dust! A fitting memorial for a remarkable human-being. (Images of the Apollo 11 Tranquility Base etc courtesy of NASA/Goddard Space Flight Center/Arizona State University)