This allows easy removal of the moon globe cover to check the neopixel lights as well as the power connections and computer. The moon is glued to the female attachment and the male ring is glued to the light ring. The moon itself is attached to the light ring with a unique screw attachment. Individual holders for the ESP32 and the RTC are also printed. The main light ring has a window for the ESP32 to peak its screen through and a wire opening for the Neopixel power from the main computer. This will truncate the model and it will print appropriately. The moon file is for the whole moon light and for this project you only want 1/2 of the globe so when you insert it into your slicing software just have have 1/2 suspended above the slicing floor and 1/2 below. If it didn't just go to the original source file listed above. I am not sure if the full file for this uploaded as it is so large. The hardest print is of course the lithophane moon. ![]() None require support and all are printed using standard Cura settings for PLA. Other than the main backing plate which is made of aluminum, all the parts are 3D printed with PLA. The back lighting of the moon changes with the hours of the day and can even accommodate hidden features such as celebrating birthdays or holidays with customized lighting patterns. The TTGO version of the ESP32 board accommodates a screen that details the HI/Low tide Hour and Minute for the next 12 hours as well as the number of hours to next Hi/Low and the current tide level in feet. It is again based on Luke Millers very nice work: . The microcontroller will run the tide script endlessly as long as it has power, requiring no internet connection for its calculations. The design is based on a ESP32 microcontroller attached to a real time clock with battery back-up running a tide program that allows it to output a light based corona that designates high and low tide. This variation relies on the many lithophane designs out there for 3D printing. This page was last updated on February 11, 2016.This is another variation on my theme of making tide clocks run by tiny microcontrollers. So even though the Moon's gravity isn't as strong as the Sun's, lunar tidal forces are stronger than solar tidal forces, so lunar tides are stronger than solar tides. In contrast, the radius of the Earth is about 1.7% of the distance between the Earth and the Moon. As a result, the difference between the Sun's gravitational pull on either end of the Earth is small. The radius of the Earth is a very small fraction of the distance between the Sun and the Earth, about 0.005%. But remember that tides concern the difference between gravity's pull at opposite sides of the Earth. This seems strange, because the Sun's gravity at Earth is much stronger than the Moon's. However, tidal forces due to the Sun are about half as strong as those due to the Moon. That's why tides around the equator are higher during both a new moon and a full moon ( spring tide). The resulting deformation of Earth looks the same when the moon is at opposite sides of its orbit, like full moon and new moon or first quarter and third quarter, as shown in the diagram on this page. ![]() Tidal forces on the other side of Earth actually pull material away from the Moon. Tidal forces on the side of Earth closest to the Moon pull material (mostly water) toward the Moon. ![]() This means that the Moon's gravity pulls most strongly on the side of the Earth closest to the Moon and least strongly on the side of the Earth farthest from the Moon. The gravitational attraction between two objects (say the Earth and the Moon) decreases with distance. It's really the difference between the the strength of gravity at two locations. A tidal force is related to gravity, but it isn't the same thing. That's a great question! Tides are caused by tidal forces, and the answer to your question lies in the definition of a tidal force. I understand this has to do with the alignment of the Sun, the Earth and the Moon, but I would expect that the gravitational effects of the Moon would be weaker during a Full Moon as the Sun is "pulling" from the opposite direction? Why are tides higher not just during a New Moon, but also during a Full Moon?
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