Taurus & Venus — a real-data sky calendar

Taurus & Venus — a real-data sky calendar

Aldebaran's real precessed position, Venus's 584-day cycle, and the Taurid meteor shower, spanning 4500 BCE to 2500 CE.

Hebrew months: 1 Tishrei (Sep), 2 Cheshvan (Oct), 3 Kislev (Nov), 4 Tevet (Dec), 5 Shevat (Jan), 6 Adar (Feb), 7 Nisan (Mar), 8 Iyar (Apr), 9 Sivan (May), 10 Tammuz (Jun), 11 Av (Jul), 12 Elul (Aug). This date drives both tabs.
Pale blue triangle: the real Taurus/Aries boundary (~1809 BCE), based on Taurus's actual width — not the evenly-divided color bands.
Small gold ticks below the bar mark close Venus-Taurus alignment years — click one to jump there.
4500 BCE2500 CE
Venus-Taurus alignment across the full historical range A line chart spanning the same 4500 BCE to 2500 CE range as the age bar above, plotting how many days separate Venus's next morning-star reappearance from Taurus's own dawn-rising date, for every sampled year. A pale blue gradient band shows the real era when the spring equinox itself sat in Taurus. A red gradient band shows how closely Taurus's most-evening point aligns with the Taurid shower's calendar peak, year by year. A vertical marker shows where the currently selected year falls. Real alignment between the Taurid shower's calendar peak (~Nov 5, fixed) and Taurus's own most-evening point (the reddest part of the ring, roughly its dusk-set date) — brightest when these two happen to coincide in the calendar. Ideal moment: Taurus most centered on the spring equinox, ~3132 BCE. Ideal moment: Taurus's most-evening point aligns with the Taurid shower's calendar peak, ~638 BCE. Real era when the spring equinox itself sat in Taurus: roughly 4456-1809 BCE (based on Taurus's real ~37 degree width, not an even 1/12 division of the precession cycle). Drag to change the selected year Your currently selected year, on the alignment timeline
Venus–Taurus alignment over time: peaks mean drifted apart, dips mean briefly realigned. A real ~2,300-year beat pattern from the mismatch between Venus's 584-day cycle and the calendar year. The dot marks your currently selected year.
The pale blue band gradually brightens toward its real peak alignment (~3132 BCE) and fades out at the real boundaries (~4456 and ~1809 BCE) when the spring equinox itself sat in Taurus.
The red band shows how closely Taurus's most-evening point (the ring's reddest section) lines up with the Taurid shower's fixed calendar peak (~Nov 5) — brightest around the year of closest real alignment.
The two bright vertical glows mark each real ideal moment precisely: blue at ~3132 BCE (Taurus most centered on the equinox), red at ~638 BCE (Taurus's evening peak meeting the Taurid peak).
Note: Hesiod's Pleiades/Taurus observations date to roughly 700 BCE, which by the age bar above falls in the Age of Aries, not the Age of Taurus.
Venus that day:
Year wheel with Taurus and Venus rings, a Taurid peak marker, and a bracket showing the full Taurid active range A circular calendar with Hebrew and Gregorian month labels. A tapering outer ring for Taurus and a tapering inner ring for Venus, plus feast-day dots, solstice and equinox diamonds, dawn and dusk markers, a dawn-rising marker connected to Venus's current position by an alignment spoke, and a shooting-star icon on the blue Taurid bracket marking the shower's general reference peak around November 5. Every icon and dot has a hover tooltip explaining what it represents. Taurus/Aldebaran's real invisible window, near solar conjunction Venus, invisible near inferior conjunction Venus, invisible near superior conjunction Taurid meteor shower, real active date range: Southern Taurids ~Sept 10–Nov 20, Northern Taurids ~Oct 13–Dec 10. This bracket spans the combined outer bounds (Sept 10 to Dec 10), a fixed modern calendar range like the solstice markers, not precession-adjusted. Taurids active: Sep 10–Dec 10 Taurid meteor shower peak (radiates from Taurus): Southern Taurids peak around Nov 5; Northern Taurids peak around Nov 9–12. Marker shown at the general reference peak (Nov 5). Not precession-adjusted — like the solstices, this is a fixed modern calendar date. See the blue bracket for the full active range. Connects Taurus's real dawn-rising date to Venus's current position. Thicker and brighter when this year's alignment (Venus's next morning-star return vs. Taurus's dawn-rising) is close \u2014 the same value plotted on the timeline above. Taurus's real dawn-rising date: when Aldebaran reappears in the dawn sky after its invisible window. This is the anchor date used for the Venus-Taurus alignment timeline. Drag to change the year. Dawn rise Venus's nearest real morning-star reappearance to Taurus's dawn-rising date this year. Taurus's dawn-setting date: last morning appearance before the spring invisible window. Drag to change the year. Dawn set (~Apr) Taurus's dusk-setting date (Hesiod's November): the real dawn-rising date plus half a year Dusk set (Hesiod, Nov) Your selected date Your date Venus's position in its 584-day cycle on your selected date Taurus (Aldebaran) — outer ring Venus — inner ring
Sunrise-associated (orange) Sunset/evening (red) Venus: morning Dawn rise / alignment spoke Taurids: full active range
Rings shown: Taurus (Aldebaran, outer), Venus (inner).
Switch to the Heliacal View tab: the Taurus constellation there uses real spherical astronomy (local sidereal time and true altitude-azimuth transformation) to position every star, so its shape genuinely rotates and tilts by date and time.
Feast proximity to Aldebaran's rising and setting, for this year
Feast Days from rising Days from setting Closest match
This table compares against Taurus's dawn cycle only. Real heliacal visibility has a fuzzy, roughly week-wide margin — treat small numbers as "close," not exact.
Venus's 584-day cycle across eight years
Amber stripes mark Aldebaran's dawn reappearance window each year. The dark vertical line marks where your input date falls in the 8-year (2,920-day) repeat.
Venus, morning star Venus, evening star Aldebaran dawn window
Venus's own cycle (8/263/50/263-day split) is still the published average, not computed per-year.
Source associations, paraphrased
Hesiod, Works and DaysLines 383–385 tie the start of harvest to the Pleiades' rising in early May and the start of plowing to their setting in November, noting they are hidden for about forty nights and days in between.
Sefer YetzirahLists the twelve mazzalot in a fixed order beginning with Taleh (Aries) and Shor (Taurus), matching them one-to-one with the months starting at Nisan.
Real Taurus star coordinatesAldebaran, Gamma/Delta/Epsilon/Theta Tauri (the Hyades V), Lambda and Xi Tauri, Elnath and Zeta Tauri (the horn tips), and Alcyone (Pleiades) — all J2000 positions from Wikipedia/SIMBAD.
Real spherical positioningEach star's screen position in the Heliacal View is computed from its real RA/Dec via local sidereal time and the standard altitude-azimuth transformation, evaluated at Jerusalem's latitude and the specific computed clock time — not a flat, fixed offset pattern.
Taurid active range and radiantSouthern Taurids active ~Sept 10–Nov 20 (peak ~Nov 5); Northern Taurids active ~Oct 13–Dec 10 (peak ~Nov 9–12). The real radiant sits inside Taurus, between the Hyades and Pleiades — not near Orion.
These are paraphrased pointers. The Hesiod, Pliny, star-coordinate, spherical-positioning, and Taurid citations are checked against real sources or real computation; the rabbinic ones still need their primary passages confirmed before shipping.