The Moon Along the Terminator

Tonight was all terminator work on the Moon. From a Bortle 8–9 balcony in the city, the Moon is easily the most rewarding thing to point at — bright enough to cut through the light pollution, detailed enough to hold your attention for an hour.

Started with the 20mm to take in the full phase. Waxing gibbous, with the terminator running across some of the more rugged terrain. That boundary is where everything gets interesting. Low-angle sunlight exaggerates relief — craters, ridges, basin edges all show up with sharp contrast that you simply don't get under full illumination.

Switched to the 6mm with the 3x Barlow and spent time on a few crater regions near the line. The difference from a fully-lit Moon is striking. Instead of washed-out brightness, you get depth. Crater walls cast long shadows. Central peaks catch light. Uneven floors show texture.

The maria were smoother and darker, as expected. But even along their edges, subtle variations came through. What struck me most was how dynamic the whole view felt — features I've seen before looked entirely different just because the lighting angle had shifted.

There's something about the terminator that turns lunar observing from "looking at the Moon" into studying a landscape under changing light. Predictable in one sense. Never repetitive.