Time
UTC, local time and your observing calendar
One event instant can appear on different local dates. Keep the time zone with your plan.
One instant, several clock readings
UTC is a worldwide civil-time reference. Local time adds the rules of a named time zone. For example, 22:00 UTC on 5 November 2026 is 01:00 on 6 November in Europe/Istanbul. Changing the display zone does not change the event itself. Keep the date as well as the time when sharing a plan.
Why a named zone matters
Some places change their clock offset seasonally, and civil-time rules can change. A fixed GMT offset is not always a substitute for a named IANA time zone. A daylight-saving transition can skip a local time or repeat it. Yorungez keeps an explicit UTC instant and shows the relevant local date and offset separately.
An event time is not an observing window
A global phase or opposition can occur in your daytime or below your horizon. Use the event instant to understand the geometry, then check local altitude, darkness and conditions. An email reminder follows the stored instant and time-zone context; it cannot guarantee inbox timing or a visible sky.
Sources & further reading
These sources explain the scientific background. See the project page for Yorungez’s calculation and rendering limits. Science & project ↗