Epoch

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Planet Positions

PlanetRADecCon.Dist. (AU)Ang.
Size		Mag.
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Sun

Current Sunspots (SOHO/SDO)

HMI Intensitygram β€” click for full res

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Moon

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Mercury

Venus

Mars β€” Surface Feature Transits

Next Central Meridian Transits

Next time each feature crosses Mars' central meridian. Accuracy ~4 min.

FeatureLonLatDateTime (local)
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Jupiter β€” Great Red Spot

Upcoming GRS Transits

Shown when Jupiter is above horizon and sky is darker than nautical twilight. Accuracy Β±10 min.

DateTime (local)Jupiter Alt
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Jupiter System

Label above: moon is behind the planet. Label below: moon is in front.

MoonX (R♃ / ")Y (R♃ / ")Z (R♃)OffsetMag.
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Jupiter β€” Galilean Satellite Phenomena

Upcoming Events

Shown when Jupiter is above the horizon at night. Times Β±5 min within ~60 mi of Adams, MA.

Filter:
DateStart (local)End (local)Dur.SatelliteEvent
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Saturn System

Label above: moon is behind the planet. Label below: moon is in front.

MoonX (Rβ™„ / ")Y (Rβ™„ / ")Z (Rβ™„)OffsetMag
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Comets

Positions interpolated to selected epoch from 30-day JPL Horizons ephemerides. Magnitudes are anchored to real observer-reported brightness (COBS) where available and corrected across the window β€” still estimates, and comet brightness can vary significantly from any prediction. A * marks a magnitude with no observed anchor, using JPL Horizons' own (frequently unreliable) theoretical estimate instead.

CometMag.RADecConst.Elong.SkyMotionEphem.
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Source: JPL Horizons · updated nightly · β€”

Comet Ephemeris

Date
(UTC)		RADecOur Mag
Est.		T
mag		r
(AU)		Ξ”
(AU)		Elong.SkyPhaseCon.Daily
Motion
Key: Our Mag Est. Horizons' T-mag anchored to real COBS-observed brightness (offset computed once, applied across the window) β€” blank if no COBS observation was available for this comet T-mag JPL Horizons' own theoretical total magnitude β€” kept for reference, confirmed unreliable on its own for many comets r heliocentric dist. Ξ” Earth dist. Elong. solar elongation Sky morning/evening sky Phase phase angle Daily Motion Β°/day β€” green <0.1, amber 0.1–1.0, red >1.0

Positions: JPL Horizons (geocentric, ICRF J2000). Magnitudes: anchored to COBS observer reports where available; JPL Horizons' own T-mag model is used unmodified only when no COBS observation exists, and is known to differ from actual brightness by several magnitudes in some cases.