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For practical purpose a sign has been divided into 2 ¼ Nakshatras and a Nakshatra (of 13 20' arc) has been divided into four quarter each of 30 20’. In Vedic Astrology or Hindu Astrology, there is concept of Navamsha. To cast Navamsha Chart, sign has been divided into 9 parts each of 30 20’ which is incidentally equal with one quarter of Nakshatra. Lordship of quarter of Nakshatra has been decided in the sequence of Rashi and its Lord. Aries is the first sign of zodiac and its lord is Mars so, first quarter of Ashwini Nakshatra is ruled by Mars. Taurus is the second sign and its lord is Venus so, second quarter is ruled by Venus. Third sign is ruled by Mercury so third quarter is ruled by Mercury. Fourth sign is ruled by Moon so, fourth quarter is ruled by Moon. Likewise this sequence progresses upto the fourth quarter of every third Nakshatra, which have been tabulated as follows:

 

 

Sign	Star No	Nakshatra or Star (Astronomical Name) Nakshatra or Star Lord	Nakshatra Quarter	Longitude Sign-Deg- Min		Nakshatra Quarter Lord
A R I E S	1	Aswini (Beta Arietis) Ketu	i	00s 00 000’	00s 030 20’	Mars
			ii	00s 030 20’	00s 060 40’	Venus
			iii	00s 060 40’	00s 100 00’	Mercury
			iv	00s 100 00’	00s 130 20’	Moon
	2	Bharani (35 Arietis) Venus	i	00s 130 20’	00s 160 40’	Sun
			ii	00s 160 40’	00s 200 00’	Mercury
			iii	00s 200 00’	00s 230 20’	Venus
			iv	00s 230 20’	00s 260 40’	Mars
	3	Kritika	i	00s 260 40’	00s 300 00’	Jupiter
T A U R U S	3	Kritika (Eta Tauri) Sun	ii	01s 00 000’	01s 030 20’	Saturn
			iii	01s 030 20’	01s 060 40’	Saturn
			iv	01s 060 40’	01s 100 00’	Jupiter
	4	Rohini (Aldebaran) Moon	i	01s 100 00’	01s 130 20’	Mars
			ii	01s 130 20’	01s 160 40’	Venus
			iii	01s 160 40’	01s 200 00’	Mercury
			iv	01s 200 00’	01s 230 20’	Moon
	5	Mrigashira (Lambda Orionis)	i	01s 230 20’	01s 260 40’	Sun
			ii	01s 260 40’	01s 300 00’	Mercury
G E M I N I	5	Mrigashira Mars	iii	02s 00 000’	02s 030 20’	Venus
			iv	02s 030 20’	02s 060 40’	Mars
	6	Aridra (Alpha Orionis) Rahu	i	02s 060 40’	02s 100 00’	Jupiter
			ii	02s 100 00’	02s 130 20’	Saturn
			iii	02s 130 20’	02s 160 40’	Saturn
			iv	02s 160 40’	02s 200 00’	Jupiter
	7	Punarvasu (Beta Geminorium) Jupiter	i	02s 200 00’	02s 230 20’	Mars
			ii	02s 230 20’	02s 260 40’	Venus
			iii	02s 260 40’	02s 300 00’	Mercury
C A N C E R	7	Punarvasu	iv	03s 00 000’	03s 030 20’	Moon
		Pushya (Delta Cancri) Saturn	i	03s 030 20’	03s 060 40’	Sun
			ii	03s 060 40’	03s 100 00’	Mercury
			iii	03s 100 00’	03s 130 20’	Venus
			iv	03s 130 20’	03s 160 40’	Mars
	9	Aslesha (Alpha Hydroe) Mercury	i	03s 160 40’	03s 200 00’	Jupiter
			ii	03s 200 00’	03s 230 20’	Saturn
			iii	03s 230 20’	03s 260 40’	Saturn
			iv	03s 260 40’	03s 300 00’	Jupiter
L E O	10	Magha (Regulus) Ketu	i	04s 00 000’	04s 030 20’	Mars
			ii	04s 030 20’	04s 060 40’	Venus
			iii	04s 060 40’	04s 100 00’	Mercury
			iv	04s 100 00’	04s 130 20’	Moon
	11	Poorva Phalguni (Delta Leonis) Venus	i	04s 130 20’	04s 160 40’	Sun
			ii	04s 160 40’	04s 200 00’	Mercury
			iii	04s 200 00’	04s 230 20’	Venus
			iv	04s 230 20’	04s 260 40’	Mars
	12	Uttara Phalguni	i	04s 260 40’	04s 300 00’	Jupiter
V I R G O	12	Uttara Phalguni (Beta Leonis) Sun	ii	05s 00 000’	05s 030 20’	Saturn
			iii	05s 030 20’	05s 060 40’	Saturn
			iv	05s 060 40’	05s 100 00’	Jupiter
	13	Hasta (Delta Corvi) Moon	i	05s 100 00’	05s 130 20’	Mars
			ii	05s 130 20’	05s 160 40’	Venus
			iii	05s 160 40’	05s 200 00’	Mercury
			iv	05s 200 00’	05s 230 20’	Moon
	14	Chitra (Spica Virginis -Vegus)	i	05s 230 20’	05s 260 40’	Sun
			ii	05s 260 40’	05s 300 00’	Mercury
L I B R A	14	Chitra Mars	iii	06s 00 000’	06s 030 20’	Venus
			iv	06s 030 20’	06s 060 40’	Mars
	15	Swati (Arcturus) Rahu	i	06s 060 40’	06s 100 00’	Jupiter
			ii	06s 100 00’	06s 130 20’	Saturn
			iii	06s 130 20’	06s 160 40’	Saturn
			iv	06s 160 40’	06s 200 00’	Jupiter
	16	Vishakha (Alpha Libroe) Jupiter	i	06s 200 00’	06s 230 20’	Mars
			ii	06s 230 20’	06s 260 40’	Venus
			iii	06s 260 40’	06s 300 00’	Mercury
S C O R P I O	16	Vishakha	iv	07s 00 000’	07s 030 20’	Moon
	17	Anuradha (Delta Scorpio) Saturn	i	07s 030 20’	07s 060 40’	Sun
			ii	07s 060 40’	07s 100 00’	Mercury
			iii	07s 100 00’	07s 130 20’	Venus
			iv	07s 130 20’	07s 160 40’	Mars
	18	Jyehsta (Antares) Mercury	i	07s 160 40’	07s 200 00’	Jupiter
			ii	07s 200 00’	07s 230 20’	Saturn
			iii	07s 230 20’	07s 260 40’	Saturn
			iv	07s 260 40’	07s 300 00’	Jupiter
S A G I T T A R I U S	19	Moola (Lambda Scorpio) Ketu	i	08s 00 000’	08s 030 20’	Mars
			ii	08s 030 20’	08s 060 40’	Venus
			iii	08s 060 40’	08s 100 00’	Mercury
			iv	08s 100 00’	08s 130 20’	Moon
	20	Purva Ashadha (Delta Sagittari) Venus	i	08s 130 20’	08s 160 40’	Sun
			ii	08s 160 40’	08s 200 00’	Mercury
			iii	08s 200 00’	08s 230 20’	Venus
			iv	08s 230 20’	08s 260 40’	Mars
	21	Uttara Ashadha	i	08s 260 40’	08s 300 00’	Jupiter
C A P R I C O R N	21	Uttara Ashadha (Sigma sagittari) Sun	ii	09s 00 000’	09s 030 20’	Saturn
			iii	09s 030 20’	09s 060 40’	Saturn
			iv	09s 060 40’	09s 100 00’	Jupiter
	22	Shravani (Alpha Aquiloe) Moon	i	09s 100 00’	09s 130 20’	Mars
			ii	09s 130 20’	09s 160 40’	Venus
			iii	09s 160 40’	09s 200 00’	Mercury
			iv	09s 200 00’	09s 230 20’	Moon
	23	Dhanishta (Beta Delphinum)	i	09s 230 20’	09s 260 40’	Sun
			ii	09s 260 40’	09s 300 00’	Mercury
A Q U A R I U S	23	Dhanishta Mars	iii	10s 00 000’	10s 030 20’	Venus
			iv	10s 030 20’	10s 060 40’	Mars
	24	Satabhisha (Lambda Aquarius) Rahu	i	10s 060 40’	10s 100 00’	Jupiter
			ii	10s 100 00’	10s 130 20’	Saturn
			iii	10s 130 20’	10s 160 40’	Saturn
			iv	10s 160 40’	10s 200 00’	Jupiter
	25	Purva Bhadrapada (Alpha Pegasi) Jupiter	i	10s 200 00’	10s 230 20’	Mars
			ii	10s 230 20’	10s 260 40’	Venus
			iii	10s 260 40’	10s 300 00’	Mercury
P I S C E S	25	Purva Bhadrapada	iv	11s 00 000’	11s 030 20’	Moon
	26	Uttara bhadrapada (Gama Pegasi) Saturn	i	11s 030 20’	11s 060 40’	Sun
			ii	11s 060 40’	11s 100 00’	Mercury
			iii	11s 100 00’	11s 130 20’	Venus
			iv	11s 130 20’	11s 160 40’	Mars
	27	Revati (Zeta Piscum) Mercury	i	11s 160 40’	11s 200 00’	Jupiter
			ii	11s 200 00’	11s 230 20’	Saturn
			iii	11s 230 20’	11s 260 40’	Saturn
			iv	11s 260 40’	11s 300 00’	Jupiter

[A]	On the basis of above table, if we closely observe, we find that:
1.	One-quarter of Sun ruled Nakshatras fall in Fiery Signs (Aries, Leo and Sagittarius) and three-quarters in Earthy Sign (Taurus, Virgo and Capricorn). That is, Sun ruled Nakshatras have been divided in 1:3.
2.	Two-quarters of Mars ruled Nakshatras fall in Earthy Signs and two-quarters in Airy Signs.  That is, Mars ruled Nakshatras have been divided in 2:2.
3.	Three-quarters of Jupiter ruled Nakshatras fall in Airy Signs and one-quarter in Watery Signs.  That is, Jupiter ruled Nakshatras have been divided in 3:1.
[B]	F2-E-A-W2. This is the order in the following table:
	In Fiery Signs 0o - 13o 20'	Ketu ruled Nakshatras (Ashwini, Magha, Mula)
	In Fiery Signs 13o 20'- 26o 40'	Venus ruled Nakshatras (Bharani, P. Phal, P. Ashada)
	In Fiery Signs 26o 40'- Earthy Signs 10o	Sun ruled Nakshatras (Kritika, U. Phal, U. Ashada)
	In Earthy Signs 10o  - 23o 20'	Moon ruled Nakshatras (Rohini, Hasta , Shravani)
	In Earthy Signs 23o 20'-Airy Signs 6o 40'	Mars ruled Nakshatras (Mrigshira, Chitra , Dhanishtha)
	In Airy Signs 6o 40'-20o	Rahu ruled Nakshatras (Adra, Swati, Shatabhisha)
	In Airy Signs 20o -Watery Signs 3o 20'	Jupiter ruled Nakshatras (Punarvasu, Vishakha, P.Bhad)
	In Watery Signs 3o 20'- 16o 40'	Saturn ruled Nakshatras (Pushya, Anuradha ,U. Bhadra)
	In Watery Signs 16o 40'- 30o	Mercury ruled Nakshatras (Ashlesha, Jyeshta, Revati)