PULL · 30 MAY 2001

This was
your sky.

Stellar Spectral Types: OBAFGKM

NASA APOD · KPNO

COSMIC MESSAGE

Astronomers classify stars into spectral types, originally based on hydrogen absorption lines. The system now uses letters like OBAFGKM to describe a star's temperature. This image shows the spectrum of an O star, followed by progressively cooler designations, illustrating how stellar light changes with temperature.

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COMMON

2001-05-30 · ♊

SKYBORN

Stellar Spectral Types: OBAFGKM

NASA APOD · KPNO

BORN 9160 days ago

SKYBORN.APP

Move your cursor across the card to tilt it. Holographic foil ripples through the edges and surface as you go.

ZODIAC CONTEXT

♊

GEMINI

In tropical astrology, 30 MAY 2001 falls under Gemini (♊). The sign's window runs from 05-21 through 06-20. Gemini is named for the twin stars Castor and Pollux, both bright enough to spot without a telescope. The Sun was crossing this region of the sky on 30 MAY 2001.

THE ALMANAC FOR 30 MAY 2001

DAY

Wednesday

MOON

First quarter, 54% lit

POSITION

Day 150 of 365

SAME DAY, OTHER YEARS

NEARBY DATES

This was your sky.

Stellar Spectral Types: OBAFGKM

This was
your sky.