Days of the week and its Astrological links:

Day [वार]: Sunday [रविवार]
Planet [ग्रह]: Sun [रविग्रह / सूर्यग्रह]
Deity [देवता]: Siva [शिव]
Colour [वर्ण]: Red [रक्त], Pink [पाटल] & Maroon [घनारुण]
Metal [लोह]: Gold [स्वर्ण]
Element [भूत]: Fire [अग्नि]
Number [सङ्ख्या]: 1 [एकः]
Zodiac sign [राशिचक्र]: Chingam [श्रावण] / Leo [सिंह]
Gemstone [रत्न]: Ruby [माणिक्यं - Manikyam]

Day: Monday [सोमवार]
Planet: Moon [चन्द्रग्रह]
Deity: Parvathy [पार्वती]
Colour: White [शुभ्र]
Metal: Silver [रजत]
Element: Water [जल]
Number: 2 [द्वे]
Zodiac sign: Karkkidakam [आषाढ़] / Cancer [कुलीर / कर्क]
Gemstone: Pearl [मुक्ता - Muthu]

Day: Tuesday [मङ्गलवार]
Planet: Mars [मङ्गलग्रह]
Deity: Murugan & Hanuman [सुब्रह्मण्य & हनुमान]
Colour: Red & Pink [रक्त & पाटल]
Metal: Copper [ताम्र]
Element: Fire [अग्नि]
Number: 9 [नवं]
Zodiac sign: Medam [चैत्र] & Vrishchikam [कार्तिक] / Arius [मेष] & Scorpio [वृश्चिक]
Gemstone: Chem Pavizham / Red Corel  [रक्तकन्दल]

Day: Wednesday [बुधवार]
Planet: Mercury [बुधग्रह]
Deity: Vishnu / Saraswathy [विष्णु / सरस्वति]
Colour: Green [हरि]
Metal: Bronze [कांस्य]
Element: Earth [पुथ्वी]
Number: 5 [पञ्च]
Zodiac sign: Kanni [भाद्रपद] & Midhunam [ज्येष्ठ] / Virgo [पाथोन] & Gemini [मिथुन]
Gemstone: Marathakam / Emerald [मरकत - Marakatha]

Day: Thursday [गुरुवार]
Planet: Jupiter [गुरुग्रह]
Deity: Vishnu / Brhma [विष्णुः / ब्रह्म]
Colour: Yellow [पीत]
Metal: Gold [स्वर्णं]
Element: Sky [आकाश]
Number: 3 [त्रयः]
Zodiac sign: Dhanu [मार्गशीर्ष] & Meenam [फाल्गुन] / Sagittarius [धनु] & Pisces [मीन]
Gemstone: Manja pushyaragam / Yellow Sapphire / Topaz [पुष्पराग]

Day: Friday [शुक्रवार]
Planet: Venus [शुक्रग्रह]
Deity: Lakshmi [लक्ष्मि]
Colour: White [शुभ्र], Indigo, Orange [नारङ्ग], Violet [नीललोहित] & Purple  [धूम्र]
Metal: Silver [रजत]
Element: Water [जल]
Number: 6 [षट्]
Zodiac sign: Edavam [वैशाख] & Thulam [आश्विन] / Taurus [वृषभ] & Libra [तुल]
Gemstone: Vyram / Vajram / Diamond [वज्र]

Day: Saturday [शनिवार]
Planet: Saturn  [शनि]
Deity: Shasthav / Ayyappan [शास्तारं / अय्यप्पन]
Colour: Blue & Black [नील & काल]
Metal: Iron [अय]
Element: Air [वायुः]
Number: 8 [अष्ट]
Zodiac sign: Kumpham [माघ] & Makaram [पौष] / Aquarius [कुम्भ] & Capricorn [मकरराशि]
Gemstone: Indraneelam / Blue Sapphire [इन्दनीलं].
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