weewx-celestial
The Geocentric in your skin
Home · Installation · Configuration · Translating (i18n) · GitHub project
Everything the sample skin does is ordinary weewx-loopdata consumption:
list the almanac fields you want in [LoopData] [[Include]] fields, give
your HTML elements ids equal to the json keys, and poll loop-data.txt
from javascript. skins/Celestial/realtime_updater.inc is the reference
implementation — the dial, the rate derivation (two consecutive packets
give each body its motion; the one-second tick extrapolates between
refreshes) and the odometer are self-contained functions you can lift,
and skins/Celestial/celestial.css holds every color.
A few of the ideas worth stealing even if you build something quite different:
- Rates from consecutive packets. Two loop packets give every numeric field a per-second rate (azimuth wrap-aware); the page then advances its readouts every second between refreshes and re-anchors to truth on each packet. Extrapolation stops after a stale-feed cutoff, so a dead feed freezes rather than drifts into fiction.
- Dual-source cells. Every value cell first-paints at report time
from
$almanac(each cell individually guarded, so a less capable almanac leaves cells empty rather than failing the page) and then goes live from loop data — the page is never blank while it waits for its first packet. - A truthful badge. The LIVE badge reports the feed’s actual state:
packet age,
OFFLINEon network failure, andNO DATA (HTTP 404) — check loop_data_filewhen the web server is not serving the loop-data file where the page expects it.
The full almanac-field grammar is documented in weewx-loopdata’s manual; loopdata’s own Build a live page covers the general pattern.
The Geocentric Live on PaloAltoWeather.com
PaloAltoWeather.com’s Celestial Today page contains a Geocentric Live panel built with the same technologies as used here (weewx-skyfield and weewx-loopdata).
