I see for example, the L.O. of the Quadrantids is 283.16 and Lyrids is 32.32.

src: https://en.wikipedia.org/wiki/List_of_meteor_showers


Not $\lambda \omicron$ or $\Lambda. \mathrm{O}.$ but $\lambda_⊙{}^\circ$.

This is the solar ecliptic longitude, the position of the sun relative to the vernal equinox, in degrees clockwise. This varies from 0 at the spring equinox, over 360 degrees. The Solar longitude is a way of giving the date of a meteor shower.

The effects of leap days mean that the date of the peak of a meteor shower will vary from year to year by a few days. However, the solar longitude at a meteor's shower's peak should remain the same from year to year. That is any variation in the solar longitude peak represents a real astronomical variation in the shower, not just an artefact of how we structure the calendar.

  • $\begingroup$ Thanks Jim, is there a name for the circle with the dot in it? $\endgroup$ – MiscellaneousUser Nov 19 '16 at 19:51
  • $\begingroup$ Well Bones, It is the symbol for "sun", unicode U+2609 $\endgroup$ – James K Nov 19 '16 at 19:58

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.