The SixthLens Journal

Notes from
a curious sky.

The photographs are one part of the story. Here are the questions, experiments, and small discoveries behind them.

Featured story / Technique

How long is long enough?

Signal grows with time and noise grows with its square root. That single fact decides how you spend every clear night you get.

3 min read / Reading a photographRead the story →

Follow your curiosity

2 stories

2 Sept 20264 min read

For two thousand years the retrograde loop was the hardest problem in astronomy. It is a parallax effect, and you can watch it happen.

19 Aug 20263 min read

Signal grows with time and noise grows with its square root. That single fact decides how you spend every clear night you get.

A continuing series

What the numbers under an astrophotograph actually mean, one at a time.