Liminal

SKY VIEW horizon projection — N at top, E at left

Above horizon Below horizon

ORBIT VIEW earth-centered inertial (drag to rotate, scroll to zoom)

AZIMUTH —

ELEVATION —

RANGE —

ALTITUDE (AGL) —

SPEED —

RA (J2000) —

DEC (J2000) —

COORDS

UTC TIME —

LOCAL TIME —

NEXT RISE / SET —

3600×

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LIMINAL

know exactly when and where any object crosses your horizon

Built from a single question — can I image Artemis II Orion from my backyard observatory as it passes overhead? This tool lets you answer that for any object, any location, any time.

PRELOADED Artemis II — Orion Capsule

NASA/JSC OEM trajectory · Apr 2–10 2026 · Post ICPS sep → entry interface

01 Set your observer location — search any city or enter coordinates manually

02 Open the Object Browser and pick any planet, spacecraft, or small body

03 Set a time range and fetch the ephemeris from NASA Horizons

04 Scrub the timeline to find your imaging window — green means above horizon

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Built with Claude by @fluxa · 2026

◎ OBJECT BROWSER

OBJECT

Select from the catalogue or type directly. NAIF IDs are JPL numeric codes — negative IDs are spacecraft (e.g. -125544 = ISS), positive are natural bodies (499 = Mars).

TIME RANGE

START STOP

STEP SIZE