Of all the events surrounding Apollo 11’s landing on the Moon on July 20, 1969,
my most vivid recollection is its dreamlike quality.
Yes, it was an astonishing technological achievement and a triumph for the United States.
Yes, the astronauts—Neil Armstrong, Buzz Aldrin and Mike Collins, displayed death-defying courage.
Yes, as Armstrong said as he first alighted, this was an historic step for the human species.

But if you turned off the sound,
with its deliberately mundane and routine chatter
and stared into that black-and-white television monitor,
you could glimpse that we humans had once again
entered the realm of myth and legend.

Carl Sagan

On this page I intend to keep a running showcase of my progress towards making a moon pointer, ie. a machine which points towards the moon at all times.

Step One. Where is the moon?

After coding the movement of the moon in Grasshopper, I recorded its movement across the sky, shown in plan view below. It turns out the moon doesn´t simply orbit us, but it draws rings around us, due to the enormous amount of forces that pull it in every direction (not just the Earth, but the Sun and planets which also affect its trajectory).