Next satellite passes over a target

Costs 2 token(s) per request. Propagates current orbital elements (SGP4 over day-cached CelesTrak two-line elements) and returns the access windows over a point for 13 families: Sentinel-1 (SAR), Sentinel-2, Landsat and NISAR are free and SYSTEMATIC (routinely collecting sensors — each pass is still a geometric opportunity, not a scheduled acquisition; units whose operator announced the end of operations are excluded); WorldView, ICEYE, Capella, SkySat, Umbra, Synspective, iQPS, RADARSAT-2 and COSMO-SkyMed are commercial and AGILE (taskable ACCESS opportunities that require a paid order — NOT guaranteed collects). Each pass carries acquisition/loss and closest-approach times, peak elevation, off-nadir angle, ground distance, ascending/descending, solar elevation and sunlit flag, plus the age of the element set used. Give lat and lon, or a bbox whose centre is used. The window is capped to a 7-day horizon. When orbital elements cannot be retrieved the response sets retrieval_ok:false — that means timing is UNAVAILABLE, never "no passes". Orbital data by CelesTrak.