Sutro Tower, Moon, and Plane

A Plane, the Moon and Sutro Tower

Google Pixel 6 Pro 19mm f3.5 1/250s ISO33

Brief moment of calm before a 737 knocks the Moon into Sutro Tower. Almost.

(Related: Total Lunar Eclipse; Moon; Super Flower Blood Moon Eclipse)

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(Recent Photos)

Super Flower Blood Moon Eclipse

Updated on Saturday, February 19, 2022

Super Flower Blood Moon Eclipse

Timelapse video of the super flower blood moon lunar eclipse on May 26, 2021:

I left my GoPro Hero 8 out overnight in the hopes that the San Francisco fog would cooperate. It did, somewhat! There is some cloud cover scudding by but you can see the eclipse pretty clearly. The advantage of the GoPro is that it has a wide field of view to capture the entire eclipse and is water (fog) proof and so unconcerning to leave out all night. The disadvantage is that you can't really nail the exposure. In nightlapse mode the shortest shutter speed you can set is five seconds in raw mode - way too long. In regular timelapse mode you can't set the shutter speed at all. I dialed in 2 stops of exposure compensation but that wasn't really enough. Better than the last one I accidentally caught on a dropcam so progress at least.

(Related: One Year of Tides Animated (with Sun and Moon); Total Lunar Eclipse; Animation of a year of Global Cloud Cover)

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(More Timelapses)

One Year of Tides Animated (with Sun and Moon)

Updated on Saturday, February 19, 2022

One Year of Tides Animated (with Sun and Moon)

This animation shows a year of tides in San Francisco with the sun and moon:

I was inspired to create this after adding a tide forecast to a personal weather dashboard I have running on an old Surface Pro. I realized I didn't understand tides that much. I still don't, but I know more than I did before.

The animation illustrates four components of the tide. The obvious ones are the position of the sun and moon. When the moon is new or full the Earth, sun and moon are all lined up leading to larger 'spring' tides, which happen twice a month just like spring doesn't. As the moon waxes or wanes and becomes half full the moon and sun are at right angles and partially cancel each other out resulting in lower highs and higher lows. This is the neap tide, almost as unhelpful as 'spring'.

As orbits are not circles the Earth is closer or further away from the sun over the course of a year and the moon behaves the same way. When it's close than usual we get super moons and king tides (finally a type of tide that does what it sounds like). In the animation the sun and moon actually grow and shrink in proportion to their distance from Earth.

Here's how to read the animation. The date and time at the bottom of the screen refers to the tide right in the middle. The full screen shows the forecast running from 12 hours before the current time to 12 hours later. The vertical range is from -4 feet to 10 feet, relative to mean lower low water (MLLW), the average lowest tide over 19 years. The sun and moon are on a different scale - 360 degrees horizontally and 90 degrees vertically.

The tide forecast is pulled from the NOAA Tides and Currents API. I used SunCalc-Net for the position of the sun and moon, and the phase of and distance to the moon. For the distance to the sun I used a formula I found on StackExchange.

I wanted to both fit in a full year and run slowly enough to see what's going on each month so the video is around 20 minutes long. I won't be offended if you don't finish it.

(Related: Summer Solstice 2020; Animation of a year of Global Cloud Cover; Super Flower Blood Moon Eclipse)

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ISS Lunar Transit (4K Video)

Updated on Saturday, February 19, 2022

ISS Lunar Transit (4K Video)

I tried this with a solar transit last year and discovered that my expensive phone can't keep time. Learned my lesson - for this lunar transit I shot video a few minutes before and after. The video is 4K and has the unedited 1 second transit and a zoomed in slow version where you can actually see the thing. Unfortunately this means the composite at the top is made from frames extracted using ffmpeg. Next time, two cameras, so I can attempt a burst as well as a video.

Shot on a Sony RX10 IV from San Francisco.

(Previously)

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(Recent Photos)

Moon

Updated on Saturday, May 2, 2020

Moon

Photo of the moon, taken with a Sony RX10 Mk 2 super zoom camera.

(Related: Sutro Tower, Moon, and Plane; Super Flower Blood Moon Eclipse; Jupiter from Casini Ranch)

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(Recent Photos)

Total Lunar Eclipse

Updated on Saturday, February 19, 2022

Total Lunar Eclipse

Total lunar eclipse (blood moon) from April 4, 2015. Timelapse created from Dropcam footage from the ITHCWY webcam which just happened to be pointed in the right direction.

(Also see Super Flower Blood Moon Eclipse from May 26, 2021.)

(Related: Super Flower Blood Moon Eclipse; One Year of Tides Animated (with Sun and Moon); Sutro Tower, Moon, and Plane)

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(More Timelapses)

I Thought He Came With You is Robert Ellison's blog.

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