golden_angle_spiral

m4opt.skygrid.golden_angle_spiral(area)

Generate a tile grid from a spiral employing the golden angle.

This is a spiral-based spherical packing scheme that was used by GRANDMA during LIGO/Virgo O3 [1].

Parameters:

area (Annotated[Quantity, PhysicalType('solid angle')]) – The average area per tile in any Astropy solid angle units: for example, 10 * astropy.units.deg**2 or 0.1 * astropy.units.steradian.

Returns:

The coordinates of the tiles.

References

[1]

S. Antier, S. Agayeva, M. Almualla, et al. GRANDMA observations of advanced LIGO’s and advanced Virgo’s third observational campaign. MNRAS, 497(4):5518–5539, October 2020. arXiv:2004.04277, doi:10.1093/mnras/staa1846.