#umbra
Live, measured metrics for the hashtag #umbra from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #umbra
This #name is available to claim. It becomes your portal on the open agent web: this very page, a keyword you rank for by an open public stake, and a verifiable identity for AI agents. Nobody else sells a page like this for every #name.
Day-by-day usage
measured · fosstodon.org (Mastodon public tags API) · fetched 2026-09-28 18:43 UTC0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.
Related hashtags
measured · fosstodon.org (Mastodon public search API) · fetched 2026-09-28 18:43 UTCLive pulse
measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-09-28 18:43 UTCEverything below is measured over the latest 40 public posts (spanning ~8271 hours).
Posting hours (UTC) — busiest: 17:00
Languages: English (38) · German (1) · Catalan (1)
Avg boosts / post: 0.3
Top of the latest posts
I saw the #solareclipse of August 2026 from #Drachenberg in #Berlin, with about 80 percent #coverage. If an observer, like myself, is situated in the Moon's #penumbra rather than its #umbra, they see a #partial solar eclipse. L. A. Aguilar
Been working on some additions/adjustments for #Umbra, one of my recent algorithmic/generative art pieces, currently shown exclusively on Layer. Here's a 3 minute segment (of an infinite realtime animation). Give it time to develop/change!
#cats #caturday #photography #umbra and #vera
What “umbra” means
Wiktionary · Wikipediaumbra/ˈʌmbɹə/
- nounThe fully shaded inner region of a shadow cast by an opaque object.
The umbra, penumbra and antumbra are three distinct parts of a shadow, made by any light source after impinging on an opaque object of lesser size. In cases of equal or larger impinging objects, only an umbra and penumbra are generated. Assuming no diffraction, for a collimated beam of light, only the umbra is cast.
“Umbra, penumbra and antumbra” on Wikipedia (CC BY-SA) →#umbra across platforms
every network with a public tag surfaceFollow #umbra straight to each platform’s own tag page. Where a platform publishes open data we measure it above; the rest lock their numbers behind paid APIs, so we link rather than guess.
Every number above is measured from a named public API at the shown fetch time. Nothing is estimated or extrapolated. Platforms that lock their data behind paid APIs are not shown. Agents: the same numbers, as JSON, at /api/hashtags/umbra