47 lines
1.2 KiB
Markdown
47 lines
1.2 KiB
Markdown
# moonmath
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## Bullshit BTC Price Projections, Now in Your CLI!
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This is a re-implementation of [Moon Math][moon] that runs locally as a CLI
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program. It's written in Go using the [Bubble Tea][tea] library, and uses
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[Coindesk][coin] to source price data.
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[moon]: https://www.moonmath.win
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[tea]: https://github.com/charmbracelet/bubbletea
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[coin]: https://www.coindesk.com
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### "Theory"
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Given a pair of quotes taken at the start and end of some period,
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$$ (t_s, p_s), (t_e, p_e) $$
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we can derive the total gain for that period, and its length in days.
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$$ g = p_e / p_s $$
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$$ d = t_e - t_s $$
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Combining these, we can calculate the *compounding daily periodic rate* (CDPR).
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$$ r = g^{1/d} $$
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We can use this rate to project the price $ p_f $ at some $ x $ days in the
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future.
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$$ p_f = p_e r^x $$
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If we instead make $ p_f $ a target price, we can solve this equation for $ x $,
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telling us how many days it will take to reach that target.
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$$ x = {{log(p_f) - log(p_e)} \over log(r)} $$
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### Future Improvements
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* Support other assets available from Coindesk.
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* Configurable projection milestones.
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* Allow projection by date, e.g. use the CDPR to calculate what the price
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would be on a particular date.
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* Log errors to a file.
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