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John Arban Lewis johnarban

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@johnarban
johnarban / nasa-image-api-preview.md
Created October 21, 2026 14:11
NASA Image API Preveiw
@johnarban
johnarban / human_readable_rates.js
Created July 10, 2026 22:00
Generate human readable rates from a speed-up factor
// human readable rates
// converting from 1000x to
function rounded(value, precision) {
scale = 10**precision
return Math.round(value * scale) / scale
}
function niceRate(rate, p = 1) {
if (rate < 120) {
return `${rate} x`
@johnarban
johnarban / keyed_stack.ts
Created June 23, 2026 22:44
A keyed stack or LRU-like cache. push things on to the stack and as it fills up it pops them off the bottom
/**
* A stacked hashmap of max height.
* The first element is the first removed
*/
class KeyedStack<K, T> {
private _stack: K[] = [];
private _map: Map<K, T> = new Map();
private _maxSize: number;
@johnarban
johnarban / Physdemo setups.md
Last active March 28, 2026 01:18
physdemo telescope setups
@johnarban
johnarban / faceted_categorical_subsets.py
Last active March 16, 2026 21:52
glue / Create faceted subset from a categorical component
def create_faceted_subsets(data, component, skip_nan=True):
vals = data.to_dataframe()[component].unique()
for v in vals:
if skip_nan and v != v: # catches NaN
continue
dc.new_subset_group(
label=str(v),
subset_state=(data.id[component] == v)
@johnarban
johnarban / skyfield_test.py
Created March 2, 2026 14:32
Get test rise, transit, and set values for the sun on the 2025 march equinox using Skyfield
from skyfield import almanac
from skyfield.api import load, wgs84
eph = load("de440s.bsp")
ts = load.timescale()
obs = eph["earth"] + wgs84.latlon(0.0, 0.0, elevation_m=0.0)
sun = eph["sun"]
t_utc = ts.utc(2025, 3, 20, 9, 1, 0)
year, month, day, _, _, _ = t_utc.utc
@johnarban
johnarban / index.html
Created January 20, 2026 13:58
WWT Bug Demo
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1" />
<title>WWT Asteroid Orbit (Hosted Model)</title>
</head>
<body>
<div id="wwtcanvas"></div>
<div id="ui">
@johnarban
johnarban / Testing Vue Reactivity with Classes.vue
Last active January 11, 2026 01:24
Testing Vue Reactivity with Classes
<script setup lang="ts">
import { ref, type Ref, reactive } from 'vue'
class Person {
name: string
age: number
called = 0;
constructor(name: string, age: number) {
this.name = name
this.age = age
@johnarban
johnarban / App.vue
Created September 22, 2025 16:52
Vue SFC Playground showing how refs and values passed to composables work
<script setup>
import { ref } from 'vue'
import { useTest } from './test';
const notRefValue = 3
const refValue = ref(7)
const test = useTest(notRefValue, refValue)
@johnarban
johnarban / binaryajax.js
Created August 2, 2023 15:26 — forked from harchs/binaryajax.js
/*
* Binary Ajax 0.1.10
* Copyright (c) 2008 Jacob Seidelin, cupboy@gmail.com, http://blog.nihilogic.dk/
* Licensed under the MPL License [http://www.nihilogic.dk/licenses/mpl-license.txt]
*/
var BinaryFile = function(strData, iDataOffset, iDataLength) {
var data = strData;
var dataOffset = iDataOffset || 0;