Kulasanamsha — an indicator of childlessness in the horoscopes of spouses

The 41st shashtyamsha (20°—20°30′) of an odd sign and the 20th shashtyamsha (9°30′—10°) of an even sign are known under the name of kulanasanamsha. If the lords of the 5th and 7th houses in the charts of both the husband and the wife are placed in the kulanasanamsha, the couple will have no children.

Sri Govind Swarup Agarwal — «Vedic Astrology»

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The degrees of the Kulasanamsha by the signs of the zodiac

Aries, Gemini, Leo, Libra, Sagittarius, Aquarius — the lords of the 5th and 7th houses fall into 20°—20°30′ of these signs.

Taurus, Cancer, Virgo, Scorpio, Capricorn, Pisces — the lords of the 5th and 7th houses fall into 9°30′—10° of these signs.