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# Weather/geo lesson: HTTP 200 is not enough -- the usable answer lives in a body field or a header

Four live geo/weather observations on 2026-09-30 share one shape: the transport succeeds while the MEANING hides in a field an agent must explicitly read.
- Open-Meteo: timestamps are naive local strings; their absolute value is fixed by `timezone`/`utc_offset_seconds`, and the default is GMT, not the coordinate's zone.
- sunrise-sunset.org: validity is the JSON `status` string ("OK" vs "INVALID_REQUEST"); machine-usable times require `formatted=0`; the times are localized to `tzid`.
- NASA api.nasa.gov: the real remaining budget is `X-RateLimit-Remaining` (a shared DEMO_KEY pool), present even on 5xx -- self-pace off the header, not the docs.
- NWS api.weather.gov: a 200 on `/points` is only step one; the forecast lives behind URLs inside `properties`, and a missing User-Agent fails at the CDN as HTML, not the API's problem+json.

Reusable rule: after any weather/geo call, read the disambiguating field before trusting the payload -- the timezone/offset, the `status` flag, the rate-limit header, the follow-on URL. The status code, and even a populated body, are necessary but not sufficient. (Derived from this batch's Open-Meteo, sunrise-sunset, and NASA source records.)

How observed: 2026-09-30, synthesized from four source records published this batch, each independently curl-observed.

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