ISS Passes Over Calgary

Next ISS Pass Over Calgary

Loading a forecast, not a live observation.

Loading forecast…

Loading pass predictions...

Know the assumptions behind the Calgary reference

The calculation uses the YYC coordinates from PocketWorld's city directory and the observer-altitude value printed beside the forecast. The existing request uses zero metres as an input; that is a modelling assumption, not a statement of Calgary's elevation or the height of your observing location. This page therefore presents a reference prediction, not a survey-grade schedule for a particular property.

If you compare these results with another prediction tool, check its latitude, longitude and observer altitude first. Do not change your actual location to match this reference merely to make two tables agree. Use a tool with your intended observer settings when position-specific precision matters.

Separate the forecast horizon from the skyline you see

The maximum-elevation figure is an angle relative to the observer's horizon. It does not encode the outline of nearby buildings, vegetation or terrain. The table cannot determine whether a particular direction is obstructed at the place where you will stand. An apparently promising angle is one input to planning, not a guarantee of an unobstructed sighting.

The map button helps identify the station in a wider orbital context. It does not recalibrate this page's forecast when you move the globe, and it should not be used as evidence that the station is visible through local cloud. Keep the reference forecast and the live position view as separate tools.

For a Calgary comparison, preserve the UTC date, start and end times, observer coordinates and retrieval timestamp together. If the magnitude is unavailable, leave it unknown instead of assuming a faint pass. If the visible duration is shorter than the full predicted time window, do not stretch that duration into a promise of continuous visibility.

The linked Canadian astronomy-weather products provide a separate check on sky conditions. When the forecast service fails, use the official observation resources rather than interpreting the failure as ten days without a possible sighting.

Observer settings and forecast scope

Reference: YYC, Calgary, Canada. Latitude 51.1215°, longitude -114.0076°. Observer altitude input: 0 metres. This fixed input is not a measurement of the city's elevation or your location. The request asks N2YO for up to 10 days of visual passes with a minimum visible duration of 60 seconds. Results can be cached for up to one hour; the retrieval timestamp is shown with the table.

All table dates and times are UTC, not automatically converted to your local time zone. Keep the date when converting. The countdown depends on your device clock. A predicted start and end describe a pass window; the separately reported visible duration can be shorter. Maximum elevation is an angle above the horizon. An unknown magnitude is not a prediction of a faint pass.

When the table cannot answer your question

Read the status message before relying on the countdown. A partial list contains only the source entries that passed validation. An unavailable result provides no reliable schedule at all. The page makes one bounded request rather than repeatedly contacting the provider in the background. If loading fails, reloading makes another attempt; the source links below remain usable independently of that request. Closing or leaving the page stops its countdown timer.

Seeing the ISS from Calgary

A forecast is not proof of visibility from your position. Sunlight on the station, a sufficiently dark sky, cloud and your local horizon all matter. The globe's position marker is not a confirmed sighting.

Observation and forecast sources

• Canadian Space Agency: how to see the space station — observation guidance.
• NASA Spot the Station FAQ — visibility and prediction fields.
• N2YO API documentation — forecast data, observer inputs and field definitions.
• Environment and Climate Change Canada: astronomy weather — a separate check of forecast sky conditions, not ISS position.