Table 1 Residential building sunlight standards.

From: Research on the open space ratios of residential plots in major Chinese cities meeting public centralized green space standards

Climate zoning

I, II, III, VII

IV

V, VI

Permanent urban population (in ten thousand)

 ≥ 50

 < 50

 ≥ 50

 < 50

Unlimited

Sunlight standard day

The day of the Great Cold

The day of the Winter Solstice

Sunlight duration (h)

 ≥ 2

 ≥ 3

 ≥ 1

Effective sunlight duration zone (local true solar time)

8:00 to 16:00

9:00 to 15:00

Calculation starting point

Ground-level window sill

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