A grand tomb that may have been built for Alexander the Great's best friend and bodyguard around 2,300 years ago has an astronomical secret: Its burial chamber is aligned so that sunlight enters it on the winter solstice, a new study proposes.
However, not everyone agrees with this interpretation. Some experts note that the ancient Macedonians used a lunisolar calendar, meaning the winter solstice's date would have moved from year to year.
