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104 lines
2.3 KiB
Markdown
104 lines
2.3 KiB
Markdown
---
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id: 68c497f3aaefc9fd9f1b0e24
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title: "Challenge 60: Space Week Day 6: Moon Phase"
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challengeType: 29
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dashedName: challenge-60
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---
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# --description--
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For day six of Space Week, you will be given a date in the format `"YYYY-MM-DD"` and need to determine the phase of the moon for that day using the following rules:
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Use a simplified lunar cycle of 28 days, divided into four equal phases:
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- `"New"`: days 1 - 7
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- `"Waxing"`: days 8 - 14
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- `"Full"`: days 15 - 21
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- `"Waning"`: days 22 - 28
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After day 28, the cycle repeats with day 1, a new moon.
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- Use `"2000-01-06"` as a reference new moon (day 1 of the cycle) to determine the phase of the given day.
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- You will not be given any dates before the reference date.
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- Return the correct phase as a string.
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**Note:** Day 1 represents the day of the new moon, meaning 0 days have passed since the last new moon.
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# --hints--
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`moon_phase("2000-01-12")` should return `"New"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(moon_phase("2000-01-12"), "New")`)
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}})
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```
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`moon_phase("2000-01-13")` should return `"Waxing"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(moon_phase("2000-01-13"), "Waxing")`)
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}})
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```
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`moon_phase("2014-10-15")` should return `"Full"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(moon_phase("2014-10-15"), "Full")`)
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}})
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```
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`moon_phase("2012-10-21")` should return `"Waning"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(moon_phase("2012-10-21"), "Waning")`)
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}})
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```
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`moon_phase("2022-12-14")` should return `"New"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(moon_phase("2022-12-14"), "New")`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def moon_phase(date_string):
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return date_string
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```
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# --solutions--
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```py
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from datetime import datetime
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def moon_phase(date_string):
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ref_date = datetime.strptime("2000-01-06", "%Y-%m-%d")
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target_date = datetime.strptime(date_string, "%Y-%m-%d")
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diff_days = (target_date - ref_date).days
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cycle_day = (diff_days % 28) + 1
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if cycle_day <= 7:
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return "New"
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elif cycle_day <= 14:
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return "Waxing"
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elif cycle_day <= 21:
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return "Full"
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else:
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return "Waning"
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```
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