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# Weekly Challenge

Solve the challenge, share your solution and summit the ranks of our Community!

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## Challenge #251: Lunacy

13 - Pulsar

Tricky Challenge 🙂 not sure I have a particularly elegant approach - and it involved a bit of trial and error

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13 - Pulsar

Very fun spatial challenge!

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I had problems with some of the shapes until I realized it was the Earth's shadow I was cutting from the moon which may be larger.  So experimented with radius and here is what I came up with.  Also a bit messy workflow as I did each spatial process one at a time.

8 - Asteroid
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7 - Meteor

My solution:

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11 - Bolide

This was fun, thanks for the challenge.
Not particularly happy with the long formula, but...

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Quite a long formula

8 - Asteroid

Colorful moons here-- I think they came out good with the exception being the gibbous ones, which I will need to see the official solution for a better approach

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Challenge #251 in the can

8 - Asteroid

These challenges seem to be coming in the week after I do something very similar. Love utilizing the spatial tools! See spoiler for details.

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The week before this came out I was having a go at modifying state polygons, particularly Alaska because it uses both sides of the world map and I needed to isolate the state to overlay it elsewhere. I used a similar method for the half moons in this challenge by splitting the polygon to points, using a browse to identify the points I wanted to keep and then sampling or filtering before rebuilding the sequence polygon.

The other four phases were done by translation and for the gibbous, additionally dilation, then using the spatial process tool to cut or intersect.

8 - Asteroid
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Here is my solution for challenge 251, there must be a better way to solve it!

7 - Meteor
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Tried two approaches... one using a sine function to model the 'altered' portion of each moon phase, and a second using the spatial process tool to 'cut out' the proper shape for each phase. approach 2 was closer to the provided output for the challenge.

9 - Comet
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Tricky but fun! Find my video solution here: https://www.youtube.com/watch?v=BEyYaFqrsww&list=PL18SpOXDj-KMUD4YwWC5vZaUsIa7drxNZ&index=55

Find the challenge here: https://community.alteryx.com/t5/Weekly-Challenge/Challenge-251-Lunacy/td-p/706082